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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Remington Ultra Mag load data desired
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<blockquote data-quote="Dave King" data-source="post: 20985" data-attributes="member: 3"><p>Today I shot again for more data.</p><p></p><p>Now I have a mystery going, Darryl and Warren, what am I seeing here?</p><p></p><p></p><p>exerpt from an e-mail I sent...</p><p></p><p> More data today, RL-25 data but data none-the-less.</p><p></p><p> Temp 80</p><p> Humidity 100</p><p> Wind none</p><p> Rifle Tac-Ord 338 RUM</p><p> Barrel PacNor Polygonal 27.5 inch 1x8</p><p> Scope Leupold Vari-X III M1-LR (3.5 x 10 )</p><p> Chrony @ 8 ft</p><p> Target Distance 100 yards</p><p> Primer Fed 215M</p><p> Powder RL-25</p><p> Case Remington once fired and neck sized</p><p> bullet runout - minimal .001</p><p> OAL 3.650 (Same OAL for the Sierra 250s)</p><p> Bullet Sierra 300 HPBT</p><p> </p><p> #1 80 grains RL25 2403 fps (Cold Bore)</p><p> #2 81 grains RL25 2416 fps</p><p> #3 82 grains RL25 2452 fps</p><p> #4 83 grains RL25 2491 fps</p><p> #5 84 grains RL25 2506 fps</p><p> #6 85 grains RL25 2548 fps (slight "extractor" mark)</p><p> #7 86 grains RL25 2627 fps</p><p> #8 87 grains RL25 2636 fps</p><p> #9 88 grains RL25 2673 fps</p><p> #10 89 grains RL25 2688 fps</p><p></p><p> I don't know why I have the "extractor" mark on the 85 grain load, I've examined the other loads and I see ever-so-slight extractor marks on the 87 grain load but nothing on the others (I use a 3x, 5x, and 8x jewelers loupe). There is some cratering around the firing pin on the cases but I believe that's due to the looser fit of the Speed-Lock firing pin I have.</p><p></p><p> I'm a bit perplexed by the powder requirement when compared to the 250 Sierras. I expected to get nowhere near the starting load of 89 grains of RL25 for the 250 when finishing off the big 300s. I believe I'll load several more cases for the 300 load test, I'll use 90, 91, 92 etc until I feel the need to pull the trigger from a distance with a string.</p><p></p><p> The 300s sit a fair distance into the case, the boattail is below the level of the shoulder at an OAL of 3.650.</p><p></p><p> Accuracy.... I nearly wet myself!!! I mentioned to you yesterday how I shoot onto one target and plot the hits in an attempt to limit my range trips for accuracy loads. Well, today I began plotting the hits (1.5 MOA low and .5 MOA right from my established 250 grain zero) and ALL rounds impacted essentially on top of one another, so much so that I couldn't distinquish one hit from another. Final group-- .863inches for all 10 rounds of 10 different powder weights. It's just a round raggity hole, I'm pretty pleased.</p><p> BTW, today I shot at my usual spot, a farmers field into a bank for a backstop. Shot from the bipod and sandsock, much more natural and comfortable.</p><p></p><p> I believe I'll be able to get 2700 without a problem but not much more as I'll be on a compressed load. Perhaps the RL22 is the better way to go for the 300, I could perhaps get another 4 grains of powder into the case if I'm thinking correctly.</p><p></p><p> I'd guess that the powder quandry is that the RL25 is better suited to the much heavier bullet in the larger .338 bore rifle, although RL22 could offer more usable powder it may cause some pressure curve problems. Maybe I should try the RL22 in the 250s.</p></blockquote><p></p>
[QUOTE="Dave King, post: 20985, member: 3"] Today I shot again for more data. Now I have a mystery going, Darryl and Warren, what am I seeing here? exerpt from an e-mail I sent... More data today, RL-25 data but data none-the-less. Temp 80 Humidity 100 Wind none Rifle Tac-Ord 338 RUM Barrel PacNor Polygonal 27.5 inch 1x8 Scope Leupold Vari-X III M1-LR (3.5 x 10 ) Chrony @ 8 ft Target Distance 100 yards Primer Fed 215M Powder RL-25 Case Remington once fired and neck sized bullet runout - minimal .001 OAL 3.650 (Same OAL for the Sierra 250s) Bullet Sierra 300 HPBT #1 80 grains RL25 2403 fps (Cold Bore) #2 81 grains RL25 2416 fps #3 82 grains RL25 2452 fps #4 83 grains RL25 2491 fps #5 84 grains RL25 2506 fps #6 85 grains RL25 2548 fps (slight "extractor" mark) #7 86 grains RL25 2627 fps #8 87 grains RL25 2636 fps #9 88 grains RL25 2673 fps #10 89 grains RL25 2688 fps I don't know why I have the "extractor" mark on the 85 grain load, I've examined the other loads and I see ever-so-slight extractor marks on the 87 grain load but nothing on the others (I use a 3x, 5x, and 8x jewelers loupe). There is some cratering around the firing pin on the cases but I believe that's due to the looser fit of the Speed-Lock firing pin I have. I'm a bit perplexed by the powder requirement when compared to the 250 Sierras. I expected to get nowhere near the starting load of 89 grains of RL25 for the 250 when finishing off the big 300s. I believe I'll load several more cases for the 300 load test, I'll use 90, 91, 92 etc until I feel the need to pull the trigger from a distance with a string. The 300s sit a fair distance into the case, the boattail is below the level of the shoulder at an OAL of 3.650. Accuracy.... I nearly wet myself!!! I mentioned to you yesterday how I shoot onto one target and plot the hits in an attempt to limit my range trips for accuracy loads. Well, today I began plotting the hits (1.5 MOA low and .5 MOA right from my established 250 grain zero) and ALL rounds impacted essentially on top of one another, so much so that I couldn't distinquish one hit from another. Final group-- .863inches for all 10 rounds of 10 different powder weights. It's just a round raggity hole, I'm pretty pleased. BTW, today I shot at my usual spot, a farmers field into a bank for a backstop. Shot from the bipod and sandsock, much more natural and comfortable. I believe I'll be able to get 2700 without a problem but not much more as I'll be on a compressed load. Perhaps the RL22 is the better way to go for the 300, I could perhaps get another 4 grains of powder into the case if I'm thinking correctly. I'd guess that the powder quandry is that the RL25 is better suited to the much heavier bullet in the larger .338 bore rifle, although RL22 could offer more usable powder it may cause some pressure curve problems. Maybe I should try the RL22 in the 250s. [/QUOTE]
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