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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H Brass to .340 Weatherby Brass Conversion Question
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<blockquote data-quote="longestrange" data-source="post: 2027241" data-attributes="member: 75265"><p>OK, hopefully we've buried the pressure thing that's been beaten to death, let's move on to this as it is more closely related to my question.</p><p>I agree that you can neck down a 375 to 340, fireform and trim to fit nicely in the chamber. I have some serious safety issues with actually loading magnum charges into such a case. </p><p></p><p>For starters, necking down 'work hardens' the brass, thus it has a higher yield strength. It also thickens the material in the case neck. A thicker, higher strength neck is going to resist releasing the bullet far more than a soft, annealed thin neck. That will result in higher pressures. </p><p>Second, the neck expanding is what releases the bullet and establishes a seal between the chamber and the case. If the neck is too thick, it may expand on the outside, but on the inside it may not fully release the bullet. This also will result in higher pressures and possible gas leaks. </p><p></p><p>Thus it is standard practice to:</p><p>1. Anneal a case neck after it has been necked down back to factory specs.</p><p>2. Turn or ream the neck to thin it back to factory specs. </p><p></p><p>So my original question in my original post that has remained unanswered after more than a page of posts was about the neck annealing and reaming.</p></blockquote><p></p>
[QUOTE="longestrange, post: 2027241, member: 75265"] OK, hopefully we've buried the pressure thing that's been beaten to death, let's move on to this as it is more closely related to my question. I agree that you can neck down a 375 to 340, fireform and trim to fit nicely in the chamber. I have some serious safety issues with actually loading magnum charges into such a case. For starters, necking down 'work hardens' the brass, thus it has a higher yield strength. It also thickens the material in the case neck. A thicker, higher strength neck is going to resist releasing the bullet far more than a soft, annealed thin neck. That will result in higher pressures. Second, the neck expanding is what releases the bullet and establishes a seal between the chamber and the case. If the neck is too thick, it may expand on the outside, but on the inside it may not fully release the bullet. This also will result in higher pressures and possible gas leaks. Thus it is standard practice to: 1. Anneal a case neck after it has been necked down back to factory specs. 2. Turn or ream the neck to thin it back to factory specs. So my original question in my original post that has remained unanswered after more than a page of posts was about the neck annealing and reaming. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H Brass to .340 Weatherby Brass Conversion Question
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