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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lightweight 7mm Allen Magnum pics....
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<blockquote data-quote="Fiftydriver" data-source="post: 118650" data-attributes="member: 10"><p>TMR,</p><p></p><p>The differences, well, no doubt I am running a bit more pressure in the shorter barrel. I was holding the 30" barreled rifle back to insure bullet survival. I have a 34" barreled 7mm AM here that is nearling completion which will be intersting to see what she will do. It also has a 1-9 twist, 4 groove instead of 6 groove though.</p><p></p><p>Other then the pressure, the slower twist frees things up a big but not all that much. </p><p></p><p>The US869 powder is quicker burning then WC872. In some cases significantly faster burning so you can get more FPS with less powder.</p><p></p><p>In a 30" barrel, 3300 fps is fully atainable. Getting a bullet to survive it is what we are testing now. So far, from what I am seeing a 1-9 6 groove looks like the best bet so far. More to come on that later.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 118650, member: 10"] TMR, The differences, well, no doubt I am running a bit more pressure in the shorter barrel. I was holding the 30" barreled rifle back to insure bullet survival. I have a 34" barreled 7mm AM here that is nearling completion which will be intersting to see what she will do. It also has a 1-9 twist, 4 groove instead of 6 groove though. Other then the pressure, the slower twist frees things up a big but not all that much. The US869 powder is quicker burning then WC872. In some cases significantly faster burning so you can get more FPS with less powder. In a 30" barrel, 3300 fps is fully atainable. Getting a bullet to survive it is what we are testing now. So far, from what I am seeing a 1-9 6 groove looks like the best bet so far. More to come on that later. Kirby Allen(50) [/QUOTE]
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Lightweight 7mm Allen Magnum pics....
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