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Rifles, Reloading, Optics, Equipment
Reloading
6.5x55 Ackley
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<blockquote data-quote="Trickymissfit" data-source="post: 778336" data-attributes="member: 25383"><p>got to do some arguing with Bob on his data.</p><p> </p><p>1. I've never seen any factory load in a 22-250 do almost 3700 fps! As in zero! Maybe 3550 fps max out of a 26" barrel. Hand loads are good for about 3650 fps max (I have never been able to get there). What guys are showing out of a 22-250AI I can't say as i only know a couple that shoot it. But he has stated more than once that the main reason he did it was to contain brass flow.</p><p> </p><p>2. The 30-06 family would also apply to case life issues and brass flow</p><p> </p><p>3. I shot the 6mm Remington for years and he must know a source for 70K psi loads! The hottest loads I saw were with necked down .257 Roberts brass (very old stuff with thinner case walls) were in the 3400fps range and an 80 grain Blitz. The loads were very hot! Factory ammo was down a hundred fps or more. The 6mmAI was good for about 175fps more velocity, but the cases held up better</p><p> </p><p>4. the .257 Roberts (I've only seen factory +P ammo twice in my life) with a 117 grain bullet is good for the 2700fps on a good day. Hand loads are good for about 2750fps, but think 2800fps is doable. The only load data I have for +P ammo is from AA, and thier 117 grain data is about 2740 fps (seems light). Their Ackley data on the otherhand shows the same bullet at 3099fps. Also seems light.</p><p> </p><p>Being as the Roberts case and the 6mm thru 7mmAI share the same basic case, one would think what's good for one is also going to be good for the other. Yes and no is the answer. The velocity gains in the 6mm will be less as the standard case is about it for the 6mm bore. But there is a substantial velocity increase anyway. Ackley said more than once that his best cartridge design was the 7x57AI (same case). Yet the velocity gains were not as much as most think if 300 fps dosn't mean a lot with a 140 grain bullet. Hogdon shows 2800fps max in their manual, while Ackley shows a tad more than 3100 fps. Bob spoke of the 75 grain bullet in a 6mm Remington. Ackley gave loads for about 3500fps using H380 powder. Yet he shows 3700fps with the same bullet out of the improved case. Hogdon's manual is a little slower at around 3400fps. AA data seems much hotter, but they also don't do a 75 grain bullet (they did get 3600fps with a 70 grain bullet which seems very hot to me). Ackley shows a little over 300fps gain with the 250 Savage case and a 100 grain bullet</p><p> </p><p>Bob seems to have based everything off of velocity gains, but not every case was done for that issue alone. Many were done to decrease the flow of brass (Swift comes to light as well as the 30-06 cases family). Still a 225 grain bullet in a .338-06AI is good for about 2850fps. But at 500 yards the difference is about 300ft. lb. of energy. That's a nice gain in knock down power. (about 10%).</p><p> </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 778336, member: 25383"] got to do some arguing with Bob on his data. 1. I've never seen any factory load in a 22-250 do almost 3700 fps! As in zero! Maybe 3550 fps max out of a 26" barrel. Hand loads are good for about 3650 fps max (I have never been able to get there). What guys are showing out of a 22-250AI I can't say as i only know a couple that shoot it. But he has stated more than once that the main reason he did it was to contain brass flow. 2. The 30-06 family would also apply to case life issues and brass flow 3. I shot the 6mm Remington for years and he must know a source for 70K psi loads! The hottest loads I saw were with necked down .257 Roberts brass (very old stuff with thinner case walls) were in the 3400fps range and an 80 grain Blitz. The loads were very hot! Factory ammo was down a hundred fps or more. The 6mmAI was good for about 175fps more velocity, but the cases held up better 4. the .257 Roberts (I've only seen factory +P ammo twice in my life) with a 117 grain bullet is good for the 2700fps on a good day. Hand loads are good for about 2750fps, but think 2800fps is doable. The only load data I have for +P ammo is from AA, and thier 117 grain data is about 2740 fps (seems light). Their Ackley data on the otherhand shows the same bullet at 3099fps. Also seems light. Being as the Roberts case and the 6mm thru 7mmAI share the same basic case, one would think what's good for one is also going to be good for the other. Yes and no is the answer. The velocity gains in the 6mm will be less as the standard case is about it for the 6mm bore. But there is a substantial velocity increase anyway. Ackley said more than once that his best cartridge design was the 7x57AI (same case). Yet the velocity gains were not as much as most think if 300 fps dosn't mean a lot with a 140 grain bullet. Hogdon shows 2800fps max in their manual, while Ackley shows a tad more than 3100 fps. Bob spoke of the 75 grain bullet in a 6mm Remington. Ackley gave loads for about 3500fps using H380 powder. Yet he shows 3700fps with the same bullet out of the improved case. Hogdon's manual is a little slower at around 3400fps. AA data seems much hotter, but they also don't do a 75 grain bullet (they did get 3600fps with a 70 grain bullet which seems very hot to me). Ackley shows a little over 300fps gain with the 250 Savage case and a 100 grain bullet Bob seems to have based everything off of velocity gains, but not every case was done for that issue alone. Many were done to decrease the flow of brass (Swift comes to light as well as the 30-06 cases family). Still a 225 grain bullet in a .338-06AI is good for about 2850fps. But at 500 yards the difference is about 300ft. lb. of energy. That's a nice gain in knock down power. (about 10%). gary [/QUOTE]
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