I have seen about an average of 90 FPS with RL-33 over 25. 338 Lapua h-1000 or retumbo? RL-33 was made for it, and seems to shoot the best with what I had. 58 x 70 mm) is a specialized, rimless. 5-300 Weatherby Magnum reloading data with 357 loads. This is specifically due to high BC mass produced bullets available. 3 you would expect. 047 off lands). Rifle Cartridges. 300 Remington Ultra Magnum (1999) which is in turn based on a grossly modified version of the unbelted 404 Jeffery's case. Had best luck with Retumbo. Best site for precision rifle accuracy and accurate shooting. LOAD DENSITY. First off this rifle will be a Remington 700 with 24" barrel. Welcome to the Predator Masters Forums 33 PM 264 win mag accuracy vs speed: and speed with the 24" bbl. 338 Lapua Magnum Rifle Cartridge. 338 Lapua Magnum. Consider Alliant Reloder 26 for Magnum Cartridges. Ramshot Magnum, Retumbo, N570, and VV 24N41 should all work, heavy bullet, slow powder. That said, the reward can be much greater if you take the time to really dial in the optimum load for your rifle. 264 win mag for Ultra long distance. 25-06 loads? This is a discussion on 25-06 loads? within the Reloading forums, part of the Firearm Forum category; My first 25-06, an M77 heavy barrel, and the first loads I worked up were freakin' terrible. Jeffvn]Yes the H1000 and Retumbo were the best in mine for accuracy. • Always look for signs of excessive pressure. Having read the other reply by Knight Driver I will narrow down the mystery of the barrel burner syndrome tag given to the 264 some many years ago. VV-170 and VV-N570 will work. 33 is disappointing every time I use it. 5 grs produced an average MV of 2542 fps, ES 74 and SD 26. 28 Nosler with 175 Grain ELD-X Test (some graphic photos are included) Posted by Lloyd Hill on 05/12/2016. 5 grs produced and Average MV of 2666 fps, ES 14 and SD 8. 338 Lapua, there exist about a dozen various cartridges capable of exceptional accuracy and long-range performance. Powders include Hodgdon, Winchester, IMR. 172” Diameter. Any suggestions for a powder range and COL? Thanks in advance for any help. I have seen about an average of 90 FPS with RL-33 over 25. If I can't find someone who's tried it I'll go with starting loads somewhat like Retumbo. I will try going up and see what happens. You must agree to the terms below before continuing. Accuracy is the same as we were getting with. 270 Weatherby Magnum cartridge was developed by Roy Weatherby in 1943 and was one of the first commercial Weatherby cartridges to be offered to the public when he opened his business in 1945. '33 appears to be 2-3 grains slower than '25 in this case capacity. Please bare with us while we do this! Thank you. In this video we overview the reloading for the Savage 110 BA stealth in 338 Lapua Magnum so far. I have heard the 26" is better for a case of this size but I don't like anything over 24". 64mm) length case. 0 grains of Ram Magnum powder to reach 3384 fps. They are listed in order from the fastest burning to the slowest burning. I haven't had any Luck finding RL-16 or RL-33 Retumbo is good starting at 84 grains working upward to 86 gr. 338 Lapua Mag within the Reloading forums, part of the Sniping Related category; RL-33 was supposedly designed for 338LM, so I'm betting you'll find some good start loads on the bottle. I've used Berger 250 & 300's, Horn 285, 250, 225, 200, SMK 250 with RL 22 & 25, Retumbo, 7828, H & IMR 4350 and 4831, HV100, H1000 and Magpro all with varying results and groups, velo's and E. 205 CASE TYPE: CASE HOLDS: 96. There's a but though, I see that Winchester Supreme 780 shows better velocities at lower presures than the two I'm leaning towardsHow can that be? Faster powder, lower Max presures with higher velocities. When I want to go screaming fast the choice is RL-33. I tested RL 33 in the 338 RUM with the 300 gr AB with disappointing results. I've only shot a little RL-33 but it should be faster based on my testing with the 180's. Easier load work up. Near realtime tracking of who has ammo, mags and reloading supplies in stock. That's why Alliant Powder® put countless hours of research and development into creating Reloder® 33. This is a discussion on RL-33 For use in. 008 off the lands 77. on the ABLR is closer to. be careful pushing bullets in deeper in the case or out closer to the lands with an existing charge. The 338's: RUM, Lapua, and Edge by Lucas Beitner. 264 win mag for Ultra long distance. *Disclaimer: The load data contained on this site is intended for use with Barnes Bullets. With the Berger 230s, you have to hang onto it Like I mentioned above, IME the lighter you go the more shoulder pressure and bipod load it takes to make clean shots. 300 RUM|ive loaded with IMR 7828 and no luck. if i shoot 210g bergers %2B retumbo at max COAL%2C it punche||0||17 3736|02/21/2015|07:37:26|utarchery|load data for burger 185 gr. VV-570 and RL-33 are not particularly temp stable. RL-33 vs, RL-25 in. Thanks in advance for any help. Gun Expert Bryce Towsley provides advice and tips on handloading for the. But this is only my experience and your results may vary. I have heard the 26" is better for a case of this size but I don't like anything over 24". With RL 33 I'm pushing the 142 ABLR to 3200 fps (via magnetospeed measurements) with an SD of 14. AccuBond® Long Range Bullet Information. Created for the. 300 RUM|ive loaded with IMR 7828 and no luck. If I can't find someone who's tried it I'll go with starting loads somewhat like Retumbo. 338 Lapua Mag within the Reloading forums, part of the Sniping Related category; Originally Posted by mamalukino The temp deviation can also be calculated on the BC; that being said, the temp here has about a 10 degree. 26" barrel, 1/10 twist, CCI LMR primes, 208 grn Hornady Amax with Nosler brass. When I moved over to the 338 LM Improved (124 gr H2O), the chosen powders were Retumbo and VV570. 2850 to 3000 with the REloader 33 and a 300. I'll have to do some more work when I have time. But this is only my experience and your results may vary. I certify that I am at least 18 years of age, agree with the Privacy Policy and the Terms & Conditions, and consent that the information I submit will be transmitted. The accuracy wasn't terrible. So Norma-203B is "RL-15 Primo," and Norma-URP is "RL-17 Primo. 0 grains of Ram Magnum powder to reach 3384 fps. 264 produced by Winchester featured a 140 grain bullet at an advertised 3200fps from a 26" test barrel however sporting rifle velocities fell far short of these figures. Both fired at Hodgy max velocity from a 300 WM. Alliant just released RL-23 and RL-26 that have similar burn rates as 22 and 25, but are supposed to be much less temperature sensitive. All the propellants that Nosler's data indicated should shoot most accurately were also on hand except for Alliant RL-33, since all but a few spoonfuls of my supply had been shot up testing the. com • 800-531-2666 • Always consult a load manual and start with minimum loads. Started in 1984, Powder Valley has grown to become the single largest distributor of canister powder in the United States. The Western Powders burn rate chart shows Retumbo and '25 to be equal. 75" groups at 100. I will try going up and see what happens. With the 175 Barnes LRX with a max load of RL-26 velocity is 3220 ft/sec with a 24" tube with 3/4" groups. compared to Noslers 88 gr. Using bullets from Berger. Both fired at Hodgy max velocity from a 300 WM. I'll have to research Win 780, and you can only buy 24N41 in 8lb containers, so finding a pound from another guy would help. I hear the RL 33 is the most accurate and highest velocity but has temp stability problems. I started my pre-ladder tests with the 195 and RL-33 at 83 grains and went up in 1/2 grain increments. 338 Lapua Mag. I will try going up and see what happens. 338 Lapua Magnum. 300 Remington Ultra Magnum (1999) which is in turn based on a grossly modified version of the unbelted 404 Jeffery's case. 172" Diameter. 338 Lapua, although it is also ideal for a range of large magnum rifle cartridges. 300 Weatherby Magnum. Thanks in advance for any help. AccurateShooter. I'm still trying to get ahold of some RL-33 to give it a test. Reloading Supplies and Equipment. Played with a RUM once. 020") at a. If I just hang onto it like I would with the LRKM or canyon rifles(15 pounds plus) the groups are erratic. I will be using 140gr accubonds. Before I found RL-33 the go-to powder in my 338 LM Improved was Retumbo. If you chose to reload the 28 Nosler use only data contained in current manufacturer's reloading manuals. " That is also very good to know, URP is a very useful and highly efficient powder choice for many cartridges. I've seem some manuals list H 870 for both of these cartridges which i'm quite sure would be slower than RL 33. 358" Diameter. I've been using RL-17 but it is so dang temp sensitive, and I've been reading that RL26 has been pretty consistent at a wide range of temps. 338 Lapua Mag within the Reloading forums, part of the Sniping Related category; RL-33 was supposedly designed for 338LM, so I'm betting you'll find some good start loads on the bottle. Matt 11-03. I haven't had any Luck finding RL-16 or RL-33 Retumbo is good starting at 84 grains working upward to 86 gr. Using bullets from Berger Match Grade VLD Hunting, Berger Match VLD Target or Match Grade VLD Hunting, Berger , Berger. Retumbo is a closer alternative than RL-33. REL - 25 Retumbo N - 170 H - 870 870 REL - 50 H - 50BMG 24N41 AR - 2218 20N29 Sp13 Burn rate charts can never reflect the differences between powders in the correct proportion, and can only place powders in approximate burn rate envelopes. US869 is a dense propellant that allows the shooter to use enough powder to create maximum velocities in cartridges such as the 7mm Remington Ultra Magnum, 300 Remington Ultra Magnum, 30-378 Weatherby Magnum and others. on the ABLR is closer to. 300 RUM for 16 years. 0 grains of Ram Magnum powder to reach 3384 fps. Looking for reloading data that is not in our reloading manual or listed below? We can help you out! Get the latest load data by emailing us at [email protected] 30 caliber bore. Using bullets from Hornady V-MAX, Hornady A-MAX, Sierra HP, Sierra HPBT, Nosler Ballistic Tip, Hornady SST, Sierra HPBT Match, Nosler Partition, Barnes LRX, Swift Scirocco II, Nosler AccuBond, Hornady InterLock RN. I Have The Lowest Prices on rifle components. Whether you're pursuing big game animals or paper targets the Alliant line of Rifles powders has a product to suit your needs!. 33 Hodgdon UNIVERSAL 83 Hodgdon H335 133 Alliant Reloder 22 34 IMR UNEQUAL 84 Ramshot X-Terminator 134 VihtaVuori N560 35 Alliant Power Pistol 85 Accurate Arms 2230 135 VihtaVuori N165 36 Vihta Vuori N330 86 Accurate Arms 2460s 136 IMR 7828 & IMR 7828 SSC 37 Alliant Herco 87 IMR 8208 XBR 137 Alliant Reloder 25. Most of the bullets in. Alliant Reloder 33 is a new powder created by Rheinmetall Nitrochemie in Switzerland (Nitrochemie also makes Reloder 17). This is a discussion on RL-33 For use in. RL-33 vs, RL-25 in. It is also more accurate than RL-25 which is key for me. Powders with slow burn rates and high load densities will work best. 300 RUM for 16 years. RL-33 For use in. So Norma-203B is "RL-15 Primo," and Norma-URP is "RL-17 Primo. I've used Berger 250 & 300's, Horn 285, 250, 225, 200, SMK 250 with RL 22 & 25, Retumbo, 7828, H & IMR 4350 and 4831, HV100, H1000 and Magpro all with varying results and groups, velo's and E. I'll have to research Win 780, and you can only buy 24N41 in 8lb containers, so finding a pound from another guy would help. 300 Weatherby Magnum. 300 Winchester Magnum reloaders, and with good reason. The N570 has given me the best all round performance and I have no POI changes from +20 c to -20C so this is a winner for me. In January, I went to Sonora Mexico for a mule deer hunt. 3 3227 *US 869 84. I certify that I am at least 18 years of age, agree with the Privacy Policy and the Terms & Conditions, and consent that the information I submit will be transmitted. By Hodgdon's web data, retumbo, and 869 are the only powder going over 2600fps, they give it their blessing. 28 Nosler with 175 Grain ELD-X Test (some graphic photos are included) Posted by Lloyd Hill on 05/12/2016. 7mm Saum 195 Berger Loads. I've been playing with Retumbo, RL-25 and RL-33 in my 264 Win. Hello jeff; I am currently doing load workup on my 264 Win mag Model 70 Winchester Westerner with the same bullet. 5-300 Weatherby Magnum reloading data with 357 loads. 5 Sherman with 140 berger, and I have to say I used this as Retumbo speed was not there for me( great accuracy from Retumbo but a fair bit slower), and the temp stability on RL powders I am not a fan of. Clark, Mexico, MO 65265 www. be careful pushing bullets in deeper in the case or out closer to the lands with an existing charge. 338 Lapua Mag within the Reloading forums, part of the Sniping Related category; Has anyone used RL33 powder in there 338 and if so what was your load and results of that load. both directions can get you into serious over pressure conditionsIf you are going to vary seating depth, back off on the charge by at least 3 grains and work toward the edge in small steps(. I've tried a few things but haven't found a load I like yet. If I can't find someone who's tried it I'll go with starting loads somewhat like Retumbo. I haven't chrono'ed any 195's using RL33 yet. 172" Diameter. Clark, Mexico, MO 65265 www. That said, the reward can be much greater if you take the time to really dial in the optimum load for your rifle. Call if you have any questions about the store checkout process. I am looking for some load data for my Sendero 300 RUM. Ideal for over bore magnums. If I just hang onto it like I would with the LRKM or canyon rifles(15 pounds plus) the groups are erratic. 338 Lapua Magnum. 3 3227 *US 869 84. So do any of you enterprising reloading gurus have any load data for reloader33 and hornady 285 grain bthp for the 338 lapua mag? I'm not interested in" oh h1000 95 grains" or retumbo or anything else, just reloader 33. 284″ diameter bullets by handloaders. " That is also very good to know, URP is a very useful and highly efficient powder choice for many cartridges. 338 Edge; both were very accurate, '25 produced faster velocities. 75" groups at 100. 047 off lands). Welcome to the Predator Masters Forums 33 PM 264 win mag accuracy vs speed: and speed with the 24" bbl. Look for data using the 210gr class bullets, for extra info. Group went. I've used Berger 250 & 300's, Horn 285, 250, 225, 200, SMK 250 with RL 22 & 25, Retumbo, 7828, H & IMR 4350 and 4831, HV100, H1000 and Magpro all with varying results and groups, velo's and E. 75-inch group or less using its premium ammunition. 358" Diameter. '33 appears to be 2-3 grains slower than '25 in this case capacity. Pretty consistent velocities seen, but while chronographing any rounds sitting in the warmed rifle chamber indicated higher velocities, and I had to get ammo and rifle consistent temp for consistent velocity. VV-170 and VV-N570 will work. 5 grain RL-33 for a velocity of 2960. First off this rifle will be a Remington 700 with 24" barrel. 17 Rem Fireball. Some people have started using RL-33, but that seems like it would be a bit slow to me, but I shoot lighter, faster bullets as my preference for ELR in a Lapua as a balance between velocity, efficiency, and accuracy. AccurateShooter. Reloader's Guide Alliant Powder Reload Recipes ← Back. MAGNUM is the ultimate high performance magnum rifle powder. I called Ben Ammonette, Alliant powder, last week and asked what is holding up delivery of RL-33. Factory Ammunition Initial factory loads for the. Using Nosler's data, with a 26" barrel, the 26 Nosler requires 82. 5mm cousin, the 28 Nosler delivers extreme performance and responds well to careful load tuning. Was wanting the added velocity that the N570 is known for. i have a few questions. I've been handloading, shooting and hunting with a. Most of the bullets in. Tried RL-33 in a few rifles this moly 162 A-max 72 gr of Retumbo 2975 fps RL-33: I read that Alliant was going to import RL-33 which is a magnum version with. H1000 shoots best for me vs Retumbo or rl33 300 Hybrid. Piercision Rifles. As far as loads, 3100fps is starting load for 100gr with H1000, so your friend is starting on the safe side. May-June 2015 www. 338 Edge (300 GR Berger Bullets Data) reloading data with 16 loads. Easier load work up. You can crank another 200 fps by going to Retumbo, R-25, or Magpro. 338 Remington Ultra Mag. Hey fella's, I'm looking for some load data on the. Group went. I find '25 to be approximately 2 grains slower when burning 65 grains. Powders include Hodgdon, Alliant, IMR, Norma, Accurate, Ramshot, Vihtavuori. More tolerant and easy going than its 6. Its odd how it is cheaper fully loaded vs brass. 26" barrel, 1/10 twist, CCI LMR primes, 208 grn Hornady Amax with Nosler brass. Shooting the new-for-2015. It so far has worked good in every gun we tried it in. Ads listed in discussion areas are prohibited. 008 off the lands 77. Started in 1984, Powder Valley has grown to become the single largest distributor of canister powder in the United States. I've seem some manuals list H 870 for both of these cartridges which i'm quite sure would be slower than RL 33. The N570 has given me the best all round performance and I have no POI changes from +20 c to -20C so this is a winner for me. Group went. They are listed in order from the fastest burning to the slowest burning. I feel it's burning rate would probably be somewhere around the slow side of Retumbo which works good in both these rounds. Tried RL-33 in a few rifles this moly 162 A-max 72 gr of Retumbo 2975 fps RL-33: I read that Alliant was going to import RL-33 which is a magnum version with. Seems to run just at 2670 to 2710 depending on ambient temp and is quite accurate and keeps the SD and Extreme Spread in velocity quite low. When I moved over to the 338 LM Improved (124 gr H2O), the chosen powders were Retumbo and VV570. Using Nosler's data, with a 26" barrel, the 26 Nosler requires 82. You must agree to the terms below before continuing. This is specifically due to high BC mass produced bullets available. 7mm Remington Magnum (Berger Bullets Data) reloading data with 102 loads. We currently offer every brand of powder and primer offered in the United States along with an ever-expanding offering of bullets, brass, wads, shot, gun care items and ammunition. both directions can get you into serious over pressure conditionsIf you are going to vary seating depth, back off on the charge by at least 3 grains and work toward the edge in small steps(. It’s faster, more consistent from lot to lot and temp stable. com 33 A variety of bullets and powders was used to develop. I've tried a few things but haven't found a load I like yet. Jeffvn]Yes the H1000 and Retumbo were the best in mine for accuracy. 2 3237 H50BMG 76. We can predict, with some certainty, how long a light bulb will last (in use), or a shingle roof, or even a nuclear reactor. Could someone chime in with load data for a 300 RUM. My gun shot the Retumbo and H1000 real good. 338 Edge with the 300 grain Accubond and 300 Grain Berger Hybrid. 338 Lapua Magnum Load Data. 300 Weatherby Magnum. Shooting sports information, projects and woodworking, fibreglass stock making, rifle rest plans,Mauser information, Snider reloading. 7mm Saum 195 Berger Loads. FYI it takes a lot more RL-33 to hit max in my 338 LM Improved than Retumbo. Powders include IMR, Norma, Alliant, Accurate, Hodgdon, Ramshot, Vihtavuori. It was the very first outing for a wildcat cartridge that I had recently developed, and Bob Chiusano, another hunter in camp, and I used my rifle chambered for it to take very good bruins. I will be using 140gr accubonds. Thanks in advance for any help. When I moved over to the 338 LM Improved (124 gr H2O), the chosen powders were Retumbo and VV570. Created for the. The go to powders for the Lapua has been pretty much been Retumbo and H1000. 338 Lapua Mag within the Reloading forums, part of the Sniping Related category; Has anyone used RL33 powder in there 338 and if so what was your load and results of that load. Toggle 91grs of RL 33 with 129gr Nosler LRA. Rifle Cartridges. Every day, Reloading Unlimited works tirelessly to be your go-to reloading components and reloading supplies company. Best site for precision rifle accuracy and accurate shooting. 338 Lapua Magnum ?s. RL-33 For use in. 7mm Saum 195 Berger Loads. MAGNUM is the ultimate high performance magnum rifle powder. Welcome to the Predator Masters Forums 33 PM 264 win mag accuracy vs speed: and speed with the 24" bbl. This is a discussion on RL-33 For use in. I Have The Lowest Prices on rifle components. We’ve told fans of Hodgdon H4350 to give Alliant Reloder 16 (RL16) a try. Hey fella's, I'm looking for some load data on the. Powders include IMR, Norma, Alliant, Accurate, Hodgdon, Ramshot, Vihtavuori. Very good accuracy and velocity. Beginning with the. You can crank another 200 fps by going to Retumbo, R-25, or Magpro. We can predict, with some certainty, how long a light bulb will last (in use), or a shingle roof, or even a nuclear reactor. 75" groups at 100. 2850 to 3000 with the REloader 33 and a 300. I am going to try RL-33 and Retumbo also RL-26. "RE: 300 RUM help "To the OP. 17 Caliber. Share your passion for the shooting and hunting sports and all things Weatherby. 172” Diameter. Every day, Reloading Unlimited works tirelessly to be your go-to reloading components and reloading supplies company. i finally got my hands on some retumbo so im wondering if anyone has figured out some good loads that i could tr||75||33 3747|02/20/2015|08:58:39|Ryry|Wind meter. 7mm Saum 195 Berger Loads. The propellant's burn speed falls between that of Reloder® 22 and Reloder® 33, and it incorporates EI® technology to produce extremely high velocities in magnum cartridges. It dropped right back to 2960 again. I'll have to do some more work when I have time. I will be the first to. Can 264 Winchester Magnum Rise From Dead? Retumbo, H1000 for the 150 Sierra. I decided to develop a load for my TRG with the Hornady 285 ELD-M and Retumbo , and settled on the longest feed-able length I could make work reliably - 3. I have zero expertise with either powder. com has 223 243 308 6mm 7mm caliber accuracy reloading data. I've been hearing about this new bullet coming out for some time and since it has I decided to test it out. Alliant Reloder 33 is a new powder created by Rheinmetall Nitrochemie in Switzerland (Nitrochemie also makes Reloder 17). Hunting Bullets. First hand, yes, RL-33 has the ability to give higher velocity over RL-25 with 300 gr bullets due to the fact it is a slower burning powder. This information and data may vary considerably depending on many factors, including the components used, component assembly, the type of firearm used, reloading techniques, safety precautions practiced, etc. Dealer pricing available. Piercision Rifles. OP, don't load for the 338lm, but do for 300rum(makes 338edge if punched out) any way. I was a little surprised because it seems pretty slow for that. 8 shots averaged 2966 on the Magneto Speed. Is anyone working up loads or complete that can share experience of using Nosler 28 with Berger 195 gr 7mm bullet? I am bulging a new 7mm and trying to decide if keeping 7mm with Berger 195 gr or go to Nosler 28. It is also more accurate than RL-25 which is key for me. It looks like this ones going to take some work. US869 is a dense propellant that allows the shooter to use enough powder to create maximum velocities in cartridges such as the 7mm Remington Ultra Magnum, 300 Remington Ultra Magnum, 30-378 Weatherby Magnum and others. if i shoot 210g bergers %2B retumbo at max COAL%2C it punche||0||17 3736|02/21/2015|07:37:26|utarchery|load data for burger 185 gr. 5 and 3100 and had light extractor mark never did get a sticky bolt just the light extractor mark I'm hoping the slightly slower n-570 will allow me to run up to 3100. Does anyone have the Berger minimum and maximum load data for the bullet and powder?. 22-284, I would be looking in the 90 grain range of bullets. Retumbo is a closer alternative than RL-33. WARNING: The load information on this page is for my personal use in my personal firearms and is posted for entertainment purposes only. 338 RUM and. Makers like IMR, Hodgdon, Nobel Sport, Alliant powder and Accurate powder produce powders suitable for any type of reloading. 338 Edge (300 GR Berger Bullets Data) reloading data with 16 loads. 300 Weatherby Magnum. So do any of you enterprising reloading gurus have any load data for reloader33 and hornady 285 grain bthp for the 338 lapua mag? I'm not interested in" oh h1000 95 grains" or retumbo or anything else, just reloader 33. I've tried Retumbo, RL-33, and Norma 217 with mostly 175 eld-X's and 168 ablr's. 0 grains of Ram Magnum powder to reach 3384 fps. Hornady book says 85. Clark, Mexico, MO 65265 www. 3 you would expect. Specific cartridge loads need specific propellant to perform to their ballistic peak. Reloading for the. i have a few questions. 0 grains of the same powder to reach 3308 fps from a 24" barrel. GunBot does not endorse any of the retailers or products listed. The Best Hunting Bullets for the 338 Lapua Mag. This is a discussion on RL-33 For use in. As for powder RL 33 is excellent with 300 Grain Accubonds I have been using this powder for about a year now in my AR 30. Benchrest, F-Class, Tactical, Varmint, High Power precision Shooting. '33 appears to be 2-3 grains slower than '25 in this case capacity. Description: G1 BC: G7 BC: G7 Form Factor: Minimum Twist (or faster) Part # 6 MM (. Here are some of the particulars. So Norma-203B is "RL-15 Primo," and Norma-URP is "RL-17 Primo. I am going to try RL-33 and Retumbo also RL-26. Near realtime tracking of who has ammo, mags and reloading supplies in stock. Playing with it out to 600 yards I'm figuring the B. Home / Products / Hunting Bullets. Retumbo under a 300 Sierra HPBT in my Armalite 338 Lapua and find it to be quite accurate. 338 Lapua Mag within the Reloading forums, part of the Sniping Related category; Has anyone used RL33 powder in there 338 and if so what was your load and results of that load. I use N570 in my 6.