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Ultimate economy long range deer/antelope gun
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<blockquote data-quote="Fiftydriver" data-source="post: 46096" data-attributes="member: 10"><p>Brent,</p><p></p><p>I totally agree with your comments, a 300 Rum firign a 125 gr pill at 4000 fps is totally different then a 300 RUM driving a 210 gr JLK to 3200 fps. At long range the heavy is tops by a LONG margin.</p><p></p><p>But, I would also like to state that Richard Graves and I are designing these round to compete directly with the big 300's and 338 rounds by providing flatter trajectories and less wind drift.</p><p></p><p>Richard has designed a 145 gr ULD rebated Boattail for my 257 AM with a B.C. from prelim tests at .738!!!</p><p></p><p>Now the 257 AM should be able to hit 3350 to 3450 fps with this bullet out of the 30" barreled rifles they will be chambered in.</p><p></p><p>How does the 300 RUM with the 210 gr JLK at 3200 fps compare to this load?</p><p></p><p>Sure I give you the frontal area issue, no arguement here, I also give you the energy factor, but these are designed for deer and pronghorn.</p><p></p><p>The 145 gr ULD in 257 has a B.C. higher then even the 240 gr SMK which is around the .720 range.</p><p></p><p>What kind of round would it take to match the 3400 fps velocity of the 257 AM with that big 240 gr SMK. It would have to be much larger then the 30-378 in a 30" barrel thats for sure.</p><p></p><p>Even against the mighty 338 rounds with the 300 gr SMK with its .790 to .800 B.C. </p><p></p><p>The velocity advantage of the 257 AM will perfrom very solidly against these monsters as even my 34.5" barreled 338 Kahn will only hit 3100 fps with the 300 gr SMK, compared again to 3400 fps for the 257 AM.</p><p></p><p>Please remember that I designed my rounds to be used in 9 to 9.5 lb big game rifles and designed to offer the deer and pronghorn hunter ligitimate 500-600 yard range without the need for major hold adjustment. Also they must produce minimal recoil in this weight rifle.</p><p></p><p>I just wanted to design a round that everyone would be able to shoot well and these three smaller caliber rounds using the latest in bullet technology will do that. To what degee I will have to wait and see how they perform in the real world, not on paper.</p><p></p><p>I also agree that for extreme range shooting, +1000 yards, the big 300's and 338s are king. I may change my mind on that when I get my 270 AM running in a heavy rifle driving the 169.5 gr ULDs to 3350 fps with their .750 B.C. but that has yet to be proven.</p><p></p><p>Good Shooting!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 46096, member: 10"] Brent, I totally agree with your comments, a 300 Rum firign a 125 gr pill at 4000 fps is totally different then a 300 RUM driving a 210 gr JLK to 3200 fps. At long range the heavy is tops by a LONG margin. But, I would also like to state that Richard Graves and I are designing these round to compete directly with the big 300's and 338 rounds by providing flatter trajectories and less wind drift. Richard has designed a 145 gr ULD rebated Boattail for my 257 AM with a B.C. from prelim tests at .738!!! Now the 257 AM should be able to hit 3350 to 3450 fps with this bullet out of the 30" barreled rifles they will be chambered in. How does the 300 RUM with the 210 gr JLK at 3200 fps compare to this load? Sure I give you the frontal area issue, no arguement here, I also give you the energy factor, but these are designed for deer and pronghorn. The 145 gr ULD in 257 has a B.C. higher then even the 240 gr SMK which is around the .720 range. What kind of round would it take to match the 3400 fps velocity of the 257 AM with that big 240 gr SMK. It would have to be much larger then the 30-378 in a 30" barrel thats for sure. Even against the mighty 338 rounds with the 300 gr SMK with its .790 to .800 B.C. The velocity advantage of the 257 AM will perfrom very solidly against these monsters as even my 34.5" barreled 338 Kahn will only hit 3100 fps with the 300 gr SMK, compared again to 3400 fps for the 257 AM. Please remember that I designed my rounds to be used in 9 to 9.5 lb big game rifles and designed to offer the deer and pronghorn hunter ligitimate 500-600 yard range without the need for major hold adjustment. Also they must produce minimal recoil in this weight rifle. I just wanted to design a round that everyone would be able to shoot well and these three smaller caliber rounds using the latest in bullet technology will do that. To what degee I will have to wait and see how they perform in the real world, not on paper. I also agree that for extreme range shooting, +1000 yards, the big 300's and 338s are king. I may change my mind on that when I get my 270 AM running in a heavy rifle driving the 169.5 gr ULDs to 3350 fps with their .750 B.C. but that has yet to be proven. Good Shooting!!! Kirby Allen(50) [/QUOTE]
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Ultimate economy long range deer/antelope gun
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