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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Big Seven Case Capacities
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<blockquote data-quote="Brent" data-source="post: 29878" data-attributes="member: 99"><p>Len, I shot the 178 A-Max in my 30/338 Lapua IMP one time so far, 9 shots. The Oehler 43 picked up two shots as light was fading which were 3365 and 3404 fps. That was with 95gr RL25. I imagine 95.5gr would get me a solid 3400, or maybe a tad bit more. I could get 3450 - 3500 without a problem, pressure is still pretty low at 95gr. You run H870 or something and you might get 3600 with the 7mm if the barrel was long enough. I'd guess 3400-3500 in a long barrel for accuracy, and hope for better.</p><p></p><p>A side note: </p><p>Dad used 7 WSM data for the 140 load development on his 6.5 WSM, and even starting loads were way to high, obviously from the step down in barrel I.D. making more pressure, and the 6.5 bullets longer bearing surface.</p></blockquote><p></p>
[QUOTE="Brent, post: 29878, member: 99"] Len, I shot the 178 A-Max in my 30/338 Lapua IMP one time so far, 9 shots. The Oehler 43 picked up two shots as light was fading which were 3365 and 3404 fps. That was with 95gr RL25. I imagine 95.5gr would get me a solid 3400, or maybe a tad bit more. I could get 3450 - 3500 without a problem, pressure is still pretty low at 95gr. You run H870 or something and you might get 3600 with the 7mm if the barrel was long enough. I'd guess 3400-3500 in a long barrel for accuracy, and hope for better. A side note: Dad used 7 WSM data for the 140 load development on his 6.5 WSM, and even starting loads were way to high, obviously from the step down in barrel I.D. making more pressure, and the 6.5 bullets longer bearing surface. [/QUOTE]
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Big Seven Case Capacities
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