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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Rebuilding my 375 RUM
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<blockquote data-quote="benchracer" data-source="post: 817701" data-attributes="member: 22069"><p><strong>Re: building a 375 h&h</strong></p><p></p><p>I agree completely about using an H&H, or any DG cartridge, with max loads in hot weather. When I finally am able to take my rifle to Africa, you can bet I won't be taking my max handloads along. It doesn't make sense to do so given the application.</p><p> </p><p>However, for use in North America, I don't see any reason to leave that much performance on the table. Keep in mind that I have well exceeded book performance using BOOK loads with a substantially longer COAL and about .080 from the rifling. Given those specs, there is no way that I am even running hot loads yet. Moreover, I have done this using a very temp stable powder.</p><p> </p><p>I say all of that only to point out how much headroom there is in this cartridge in factory form before book loads are even exceeded. I haven't even tried to load up to more modern pressures yet.</p><p> </p><p>At this point, my theory regarding this cartridge is that the factory 3.6" OAL is the big performance thief. It limits case capacity and prevents effective use of powders of the proper burn rate to get max performance with 300g and up bullets. It seems to me that being limited to faster powders tends to limit performance with anything heavier than a 270g bullet. </p><p> </p><p>I strongly suspect that the OAL limit of 3.6" has a lot to do with the long standing practice of stuffing the H&H and similar cartridges into modified 30-06 length actions, rather than putting it in a proper magnum length action. When the H&H is housed in a proper magnum length action, a lot more of its potential can be unlocked without pushing pressures, simply from the gain in effective case capacity afforded by loading long.</p><p> </p><p>Everything I have looked at so far tells me that, even relative to already low SAAMI pressures, the .375 H&H is underloaded as it is. Simply loading it to a length that doesn't eat up case capacity and using powders with the right burn rate for the bullet weight and available case capacity does a lot to bring this cartridge alive.</p></blockquote><p></p>
[QUOTE="benchracer, post: 817701, member: 22069"] [b]Re: building a 375 h&h[/b] I agree completely about using an H&H, or any DG cartridge, with max loads in hot weather. When I finally am able to take my rifle to Africa, you can bet I won't be taking my max handloads along. It doesn't make sense to do so given the application. However, for use in North America, I don't see any reason to leave that much performance on the table. Keep in mind that I have well exceeded book performance using BOOK loads with a substantially longer COAL and about .080 from the rifling. Given those specs, there is no way that I am even running hot loads yet. Moreover, I have done this using a very temp stable powder. I say all of that only to point out how much headroom there is in this cartridge in factory form before book loads are even exceeded. I haven't even tried to load up to more modern pressures yet. At this point, my theory regarding this cartridge is that the factory 3.6" OAL is the big performance thief. It limits case capacity and prevents effective use of powders of the proper burn rate to get max performance with 300g and up bullets. It seems to me that being limited to faster powders tends to limit performance with anything heavier than a 270g bullet. I strongly suspect that the OAL limit of 3.6" has a lot to do with the long standing practice of stuffing the H&H and similar cartridges into modified 30-06 length actions, rather than putting it in a proper magnum length action. When the H&H is housed in a proper magnum length action, a lot more of its potential can be unlocked without pushing pressures, simply from the gain in effective case capacity afforded by loading long. Everything I have looked at so far tells me that, even relative to already low SAAMI pressures, the .375 H&H is underloaded as it is. Simply loading it to a length that doesn't eat up case capacity and using powders with the right burn rate for the bullet weight and available case capacity does a lot to bring this cartridge alive. [/QUOTE]
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Rebuilding my 375 RUM
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