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Long Range Hunting & Shooting
6.5x57mm AI question
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<blockquote data-quote="lancetkenyon" data-source="post: 3068060" data-attributes="member: 68875"><p>AI (or "Ackley Imp 40°") should be a crush fit with virgin brass in the parent case.</p><p></p><p>You should be able to take virgin 7x57 brass, neck down to 6.5mm, and fire form to your "AI" chamber. Just remember, when you neck down from 7mm to 6.5mm, the brass is probably slightly lengthening at the case mouth. So that is why you are feeling a lot of resistance when closing the bolt. Crush fit plus slightly longer than virgin length brass to start with. </p><p></p><p>Also, 7x57 case Length is 2.235". 6.5x57 case length is 2.232". So depending on your virgin brass length, this could be making a difference too.</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 3068060, member: 68875"] AI (or "Ackley Imp 40°") should be a crush fit with virgin brass in the parent case. You should be able to take virgin 7x57 brass, neck down to 6.5mm, and fire form to your "AI" chamber. Just remember, when you neck down from 7mm to 6.5mm, the brass is probably slightly lengthening at the case mouth. So that is why you are feeling a lot of resistance when closing the bolt. Crush fit plus slightly longer than virgin length brass to start with. Also, 7x57 case Length is 2.235". 6.5x57 case length is 2.232". So depending on your virgin brass length, this could be making a difference too. [/QUOTE]
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