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Reloading
Reloading Investment
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<blockquote data-quote="Kennibear" data-source="post: 875291" data-attributes="member: 51650"><p>Boomtube</p><p></p><p>E. Ezell's book "The Great Rifle Controversy" covers it pretty well. Eugene Stoner designed the AR 15 w/ 1-14 twist. Lousy powder (Too much Tums left over from the acid neutralizing process- ten times what was acceptable in the 308/ WC844) almost got Winchester execs tossed in jail. Same powder that jammed the guns in Viet Nam was excessively slow and highly variable in velocity in Arctic conditions. Huge controversy at the time but the Brass said "tighten the twist to 1-12" when the ballisticians asked to improve the powder. Twist went to 1-12. Over-stabilized bullets quit tumbling and punched a clean hole through the enemy. Legendary killing power of the dreaded "Black Rifle" goes away.</p><p> NATO accepts the 556 and wants better hard penetration. 1-12 stabilizes 62gr M855 just fine but bullets punch 3mm plate @ 500m better when over-stabilized @ 1-7. NATO adopts 1-7 twist to punch steel. AMU shooters are then stuck shooting the mouse gun with a 1-7 twist, way more than required even for 69gr match bullets that require only 1-10. No issued ammo in 556 requires a 1-7 twist, even the SS109/M855 62gr pill will stabilize @ 1-12, barely. The APT tracer ammo that has a very long bullet stabilizes in 1-10.</p><p> The 80gr Match loads are so long they will not feed up from the mag and must be single loaded, not something desirable in today's combat. That's why I stated 1-7 twist came first and 80gr bullets to match that twist came after.</p><p> It's a sore spot for me because some of the names engraved on the black wall of the Viet Nam Memorial got there because of this. Nobody payed for that. Those lost aren't coming back.</p><p> I'm not barking at anyone. Part of me still hurts at the thought.</p></blockquote><p></p>
[QUOTE="Kennibear, post: 875291, member: 51650"] Boomtube E. Ezell's book "The Great Rifle Controversy" covers it pretty well. Eugene Stoner designed the AR 15 w/ 1-14 twist. Lousy powder (Too much Tums left over from the acid neutralizing process- ten times what was acceptable in the 308/ WC844) almost got Winchester execs tossed in jail. Same powder that jammed the guns in Viet Nam was excessively slow and highly variable in velocity in Arctic conditions. Huge controversy at the time but the Brass said "tighten the twist to 1-12" when the ballisticians asked to improve the powder. Twist went to 1-12. Over-stabilized bullets quit tumbling and punched a clean hole through the enemy. Legendary killing power of the dreaded "Black Rifle" goes away. NATO accepts the 556 and wants better hard penetration. 1-12 stabilizes 62gr M855 just fine but bullets punch 3mm plate @ 500m better when over-stabilized @ 1-7. NATO adopts 1-7 twist to punch steel. AMU shooters are then stuck shooting the mouse gun with a 1-7 twist, way more than required even for 69gr match bullets that require only 1-10. No issued ammo in 556 requires a 1-7 twist, even the SS109/M855 62gr pill will stabilize @ 1-12, barely. The APT tracer ammo that has a very long bullet stabilizes in 1-10. The 80gr Match loads are so long they will not feed up from the mag and must be single loaded, not something desirable in today's combat. That's why I stated 1-7 twist came first and 80gr bullets to match that twist came after. It's a sore spot for me because some of the names engraved on the black wall of the Viet Nam Memorial got there because of this. Nobody payed for that. Those lost aren't coming back. I'm not barking at anyone. Part of me still hurts at the thought. [/QUOTE]
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