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Rifles, Reloading, Optics, Equipment
Reloading
need help w/ M1A
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<blockquote data-quote="Bart B" data-source="post: 497970" data-attributes="member: 5302"><p>I remember his term as "....like a turd in a punch bowl." But whatever it takes to get a lot of clearance between the case body and chamber walls. Jim Hull tried every conceivable resizing technique available. None produced the accuracy in Sierra's rail guns testing bullets as full length sized cases in gelded dies used in standard SAAMI chambers. Even several thousandths clearance between case and chamber neck was a good thing to do.</p><p></p><p>Few people know why such a case to chamber fit produces accuracy second to none. With a lot of clearance aroiund the case body, there's no way there'll be any interference between case and chamber body except where the extractor pushes the case against the chamber at the pressure ring point. And the front of the case is well centered as its shoulder mates perfectly with the chamber shoulder when the firing pin drives it into hard contact with the chamber shoulder.</p><p></p><p>Jim Hull was the first person to clue me in that new belted cases typically shoot more accurate than conventional full length or neck only sizing.</p></blockquote><p></p>
[QUOTE="Bart B, post: 497970, member: 5302"] I remember his term as "....like a turd in a punch bowl." But whatever it takes to get a lot of clearance between the case body and chamber walls. Jim Hull tried every conceivable resizing technique available. None produced the accuracy in Sierra's rail guns testing bullets as full length sized cases in gelded dies used in standard SAAMI chambers. Even several thousandths clearance between case and chamber neck was a good thing to do. Few people know why such a case to chamber fit produces accuracy second to none. With a lot of clearance aroiund the case body, there's no way there'll be any interference between case and chamber body except where the extractor pushes the case against the chamber at the pressure ring point. And the front of the case is well centered as its shoulder mates perfectly with the chamber shoulder when the firing pin drives it into hard contact with the chamber shoulder. Jim Hull was the first person to clue me in that new belted cases typically shoot more accurate than conventional full length or neck only sizing. [/QUOTE]
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