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Long Range Hunting & Shooting
7-300 wins the 1100 yard match!
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<blockquote data-quote="edward hogan" data-source="post: 2011566" data-attributes="member: 1341"><p>The "problem" with belted cases relates to the chamber reaming job. With a minimum oal chamber, with reamer delivering right at GO guage or .005 over, shoulder should allow only about .001-2 of stretch. Can also have your gunsmith ream to match your unfired brass neck so there's minimal stretch. Reamer might deliver a shallow belt recess, but this can be further handled by belt diameter reaming tool... Important thing is the unfired case headspaces on the shoulder, not the belt.</p><p></p><p>Factory or even custom chamberings are typically not done for case-neck headspacing on belted magnums. Got a great barrel, maybe a bit of set-back to rethread and improve the chamber?</p><p></p><p>Belted magnums were invented to allow fail-safe chambering in double-rifles of large caliber. With headspacing on the shoulder, and precision chamber, belted magnum can shoot with non-belted jobs.</p><p></p><p>The .30/338win for years was the longrange ctg of choice for its longer neck and still ample case capacity. AI one of those and the .300win would have little if any advantage.</p><p></p><p>If you want to step up to .338 high BC bullets, a .338win can be easily reamed to .338/300win which is very versatile in powder charge range, and is easily chamber improved to headspace on the neck with virgin case you will be using.</p></blockquote><p></p>
[QUOTE="edward hogan, post: 2011566, member: 1341"] The "problem" with belted cases relates to the chamber reaming job. With a minimum oal chamber, with reamer delivering right at GO guage or .005 over, shoulder should allow only about .001-2 of stretch. Can also have your gunsmith ream to match your unfired brass neck so there's minimal stretch. Reamer might deliver a shallow belt recess, but this can be further handled by belt diameter reaming tool... Important thing is the unfired case headspaces on the shoulder, not the belt. Factory or even custom chamberings are typically not done for case-neck headspacing on belted magnums. Got a great barrel, maybe a bit of set-back to rethread and improve the chamber? Belted magnums were invented to allow fail-safe chambering in double-rifles of large caliber. With headspacing on the shoulder, and precision chamber, belted magnum can shoot with non-belted jobs. The .30/338win for years was the longrange ctg of choice for its longer neck and still ample case capacity. AI one of those and the .300win would have little if any advantage. If you want to step up to .338 high BC bullets, a .338win can be easily reamed to .338/300win which is very versatile in powder charge range, and is easily chamber improved to headspace on the neck with virgin case you will be using. [/QUOTE]
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7-300 wins the 1100 yard match!
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