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The Range
Ammo & Reloading
Case necks splitting
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<blockquote data-quote="HMFIC" data-source="post: 1633840" data-attributes="member: 7539"><p>I agree about the design being rimless for better mag feed, but you're still losing me with push extraction. Do double rifles extract from the groove or the belt? Also, from what I understand, the double rifles may have only been initially offerred in .375 H&H Flanged version (which was introduced at the same time).</p><p></p><p></p><p></p><p>I was using rimmed cases as an example of what H&H would have done if their only concern were extraction. The .303 and sloppy SMLE chambers is relevant to this conversation since precision chamber geometry was an issue back in those days and again part of why H&H needed a way to reliably headspace. The .303 had it's rim, H&H wanted something rimless. In the early 1900s it wasn't nearly as easy to get precisely cut chambers as it is today, especially with such a long tapered case.</p><p></p><p></p><p></p><p>I agree and that is why some even say that full length sizing of belted mags is not ever recommended in reloading. I think we also agree on the fact that reloading to ensure the case shoulder in a .300 Win Mag is fully pressed against the chamber is the only way to go. How to do this reliably and accurately without causing other issues is the trick I guess.</p></blockquote><p></p>
[QUOTE="HMFIC, post: 1633840, member: 7539"] I agree about the design being rimless for better mag feed, but you're still losing me with push extraction. Do double rifles extract from the groove or the belt? Also, from what I understand, the double rifles may have only been initially offerred in .375 H&H Flanged version (which was introduced at the same time). I was using rimmed cases as an example of what H&H would have done if their only concern were extraction. The .303 and sloppy SMLE chambers is relevant to this conversation since precision chamber geometry was an issue back in those days and again part of why H&H needed a way to reliably headspace. The .303 had it's rim, H&H wanted something rimless. In the early 1900s it wasn't nearly as easy to get precisely cut chambers as it is today, especially with such a long tapered case. I agree and that is why some even say that full length sizing of belted mags is not ever recommended in reloading. I think we also agree on the fact that reloading to ensure the case shoulder in a .300 Win Mag is fully pressed against the chamber is the only way to go. How to do this reliably and accurately without causing other issues is the trick I guess. [/QUOTE]
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