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Fine tuning loads lee factory crimp die
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<blockquote data-quote="Petey308" data-source="post: 1641572" data-attributes="member: 106845"><p>Actually, military ammo isn't crimped to prevent bullets getting bumped out of round. That ammo is mass produced, just like all commercial ammo. They apply crimp for a couple reasons. Reason one is because that's what the criteria states in their contract to be NATO spec ammunition. The other reason is the same reason commercial ammo manufacturers do it. It's to compensate for inconsistencies in the brass and to ensure adequate bullet tension.</p><p></p><p>For mass produced ammo that isn't painstakingly made at a bench and sorted and inspected individually, etc, etc, it's a good idea. For hand loaders, making high quality ammo custom tailored to their rifles, for the intent of using it for long range hunting, forgoing the crutch that is a crimp, and tuning actual uniform neck tension is the best practice. </p><p></p><p>Again, yes, a crimp can absolutely work. It's been proven to work. I won't argue that. What I will argue, based on extensive tests done by myself and others, is that it is inferior to a good annealed neck that is sized uniformly with adequate and uniform tension on the bullet. Inferior in that crimped rounds are susceptible to being knocked out of round more so than rounds with .002-.003" of uniform tension along the entire surface contacting the bullet. </p><p></p><p>That contradicts your claim as to why the military crimps their long range ammo.</p></blockquote><p></p>
[QUOTE="Petey308, post: 1641572, member: 106845"] Actually, military ammo isn’t crimped to prevent bullets getting bumped out of round. That ammo is mass produced, just like all commercial ammo. They apply crimp for a couple reasons. Reason one is because that’s what the criteria states in their contract to be NATO spec ammunition. The other reason is the same reason commercial ammo manufacturers do it. It’s to compensate for inconsistencies in the brass and to ensure adequate bullet tension. For mass produced ammo that isn’t painstakingly made at a bench and sorted and inspected individually, etc, etc, it’s a good idea. For hand loaders, making high quality ammo custom tailored to their rifles, for the intent of using it for long range hunting, forgoing the crutch that is a crimp, and tuning actual uniform neck tension is the best practice. Again, yes, a crimp can absolutely work. It’s been proven to work. I won’t argue that. What I will argue, based on extensive tests done by myself and others, is that it is inferior to a good annealed neck that is sized uniformly with adequate and uniform tension on the bullet. Inferior in that crimped rounds are susceptible to being knocked out of round more so than rounds with .002-.003” of uniform tension along the entire surface contacting the bullet. That contradicts your claim as to why the military crimps their long range ammo. [/QUOTE]
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