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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What really makes it a magnum?
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<blockquote data-quote="Bart B" data-source="post: 680857" data-attributes="member: 5302"><p><strong>Re: Beyond the "belt"?</strong></p><p></p><p>According to H&H in the UK, they modified a rimmed double rifle cartridge's back end to the belt so the same cartridge shape and performance could be used in bolt action box magazine rifles as well as doubles. Rimmed cases have problems charging (being placed into) box magazines as well a feeding when the top round's rim is behind the round beneath it. That almost 1/4th inch long belt prevented this problem yet was excellent in controlling headspace of the H&H .275 Belted Rimless Magnum which was the H&H .275 Flanged Magnum used in double rifles.</p><p></p><p>Since 1912 when H&H started "belting" cases, belts have worked excellent in controlling headspace on cartridges with shallow angled shoulders. That belt may well be the best thing out there to prevent shoulder setback from firing pin impact before the round fires; common with most rimless bottleneck cartridges. It's my understanding that H&H tried making their Super 30 Flanged Magnum case a rimless one with the dimensions forward of the extractor groove identical to the flanged version. But its shallow shoulder angle let the shoulder set back to far from firing pin impact and had to use a belt to maintain it as well as let the round charge and feed reliably from box magazine bolt guns. The name of that round in England was the .300 Belted Rimless Magnum. When introduced in the 1920's for the USA, it was called the .300 H&H Magnum.</p></blockquote><p></p>
[QUOTE="Bart B, post: 680857, member: 5302"] [b]Re: Beyond the "belt"?[/b] According to H&H in the UK, they modified a rimmed double rifle cartridge's back end to the belt so the same cartridge shape and performance could be used in bolt action box magazine rifles as well as doubles. Rimmed cases have problems charging (being placed into) box magazines as well a feeding when the top round's rim is behind the round beneath it. That almost 1/4th inch long belt prevented this problem yet was excellent in controlling headspace of the H&H .275 Belted Rimless Magnum which was the H&H .275 Flanged Magnum used in double rifles. Since 1912 when H&H started "belting" cases, belts have worked excellent in controlling headspace on cartridges with shallow angled shoulders. That belt may well be the best thing out there to prevent shoulder setback from firing pin impact before the round fires; common with most rimless bottleneck cartridges. It's my understanding that H&H tried making their Super 30 Flanged Magnum case a rimless one with the dimensions forward of the extractor groove identical to the flanged version. But its shallow shoulder angle let the shoulder set back to far from firing pin impact and had to use a belt to maintain it as well as let the round charge and feed reliably from box magazine bolt guns. The name of that round in England was the .300 Belted Rimless Magnum. When introduced in the 1920's for the USA, it was called the .300 H&H Magnum. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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What really makes it a magnum?
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