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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H Fireform to .375 WBY?
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<blockquote data-quote="Garycrow" data-source="post: 899104" data-attributes="member: 30743"><p>You can't fireform .375 H&H to .378 weatherby, they've got different case head sizes and it won't work. You can't even rechamber most .375 H&H rifles to .378 weatherby because the actions physically aren't big enough to handle the huge weatherby case. The only real exception to that is a weatherby MKV action, it's big enough to handle the .378 weatherby and I believe a few were chambered in .375 H&H so those could be rechamered if you enlarge the bolt face too. </p><p></p><p>Now the .375 weatherby is a different story, it's merely an "improved" version of the H&H with a lot of the body taper blown out and the shoulder fireformed. Since a belted magnum headspaces on the belt instead of the shoulder it's a simple matter of having a gunsmith run a reamer into the H&H chamber and cutting it to weatherby dimensions. As long as he doesn't move the belt forward the headspace remains the same. Since they both headspace on the belt you can fire .375 H&H ammo in a .375 weatherby chamber and it'll work fine. When the brass comes out of the chamber it'll be fireformed to weatherby dimensions.</p><p></p><p>A .375 weatherby gives quite a bit extra case capacity over the H&H so it's good for about 250 fps more, but it's still not quite got the volume of a .375 RUM so it's not going to be quite as fast loaded to similar pressures. It's still an excellent round and I'd prefer it to the RUM. There comes a point with me where the recoil exceeds my comfort zone and I although I haven't fired a .375 RUM I expect it's past that level.</p></blockquote><p></p>
[QUOTE="Garycrow, post: 899104, member: 30743"] You can't fireform .375 H&H to .378 weatherby, they've got different case head sizes and it won't work. You can't even rechamber most .375 H&H rifles to .378 weatherby because the actions physically aren't big enough to handle the huge weatherby case. The only real exception to that is a weatherby MKV action, it's big enough to handle the .378 weatherby and I believe a few were chambered in .375 H&H so those could be rechamered if you enlarge the bolt face too. Now the .375 weatherby is a different story, it's merely an "improved" version of the H&H with a lot of the body taper blown out and the shoulder fireformed. Since a belted magnum headspaces on the belt instead of the shoulder it's a simple matter of having a gunsmith run a reamer into the H&H chamber and cutting it to weatherby dimensions. As long as he doesn't move the belt forward the headspace remains the same. Since they both headspace on the belt you can fire .375 H&H ammo in a .375 weatherby chamber and it'll work fine. When the brass comes out of the chamber it'll be fireformed to weatherby dimensions. A .375 weatherby gives quite a bit extra case capacity over the H&H so it's good for about 250 fps more, but it's still not quite got the volume of a .375 RUM so it's not going to be quite as fast loaded to similar pressures. It's still an excellent round and I'd prefer it to the RUM. There comes a point with me where the recoil exceeds my comfort zone and I although I haven't fired a .375 RUM I expect it's past that level. [/QUOTE]
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.375 H&H Fireform to .375 WBY?
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