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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Case head separation with new Browning X- bolt 300 win mag.
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<blockquote data-quote="Hugnot" data-source="post: 2888755" data-attributes="member: 115658"><p>Headspace at the shoulder. Having an exact or real close headspace measurement taken at the bolt face between belt & shoulder is unlikely. Ignore the belt, a useless feature put on certain cartridges & retained only because some shooters think the belt is needed with cartridges having a shoulder.</p><p></p><p>A .458WM should have a belt. There is no such thing as a .47-70 rimless.</p><p></p><p>"<em>I took the rifle to a gunsmith today who checked the head spacing with go- no go gauges and said the spacing was good.</em>" The chamber might be within specs. Repeated F/L sizing driving the shoulder back at each sizing will result in a case separation just forward of the web.</p><p></p><p>F/L size at the shoulder & forget about the belt. Getting a 6.5mm, 7mm, or .30 PRC is an option (no belt).</p><p></p><p>The 1976 Wimbledon match having a score of 299-21X was won using a .300WM head spaced at the shoulder. A shoulder based headspace would have more precise control vs belt length that might vary a few thou inch from cartridge to cartridge.</p><p></p><p>Anneal the brass to reduce spring back & head space on shoulder. I use a .007 feeler gauge between bottom of F/L die & top of shell holder that assures consistent shoulder-based headspace.</p><p></p><p>Browning ain't (is not) going to say the chamber is screwed up. There is an option of buying "long" brass.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2888755, member: 115658"] Headspace at the shoulder. Having an exact or real close headspace measurement taken at the bolt face between belt & shoulder is unlikely. Ignore the belt, a useless feature put on certain cartridges & retained only because some shooters think the belt is needed with cartridges having a shoulder. A .458WM should have a belt. There is no such thing as a .47-70 rimless. "[I]I took the rifle to a gunsmith today who checked the head spacing with go- no go gauges and said the spacing was good.[/I]" The chamber might be within specs. Repeated F/L sizing driving the shoulder back at each sizing will result in a case separation just forward of the web. F/L size at the shoulder & forget about the belt. Getting a 6.5mm, 7mm, or .30 PRC is an option (no belt). The 1976 Wimbledon match having a score of 299-21X was won using a .300WM head spaced at the shoulder. A shoulder based headspace would have more precise control vs belt length that might vary a few thou inch from cartridge to cartridge. Anneal the brass to reduce spring back & head space on shoulder. I use a .007 feeler gauge between bottom of F/L die & top of shell holder that assures consistent shoulder-based headspace. Browning ain't (is not) going to say the chamber is screwed up. There is an option of buying "long" brass. [/QUOTE]
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Case head separation with new Browning X- bolt 300 win mag.
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