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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="MagnumManiac" data-source="post: 2027247" data-attributes="member: 10755"><p>Again, I will mention case design.</p><p>As most know on here, I own a pressure trace and I DO actual destructive testing such as sectioning cases to SEE web thickness, case wall thickness and even hardness tests.</p><p>I also anneal cases and carry out the same tests to see what DIFFERENCE it makes, not only to performance but case longevity.</p><p>Weatherby case dimensions are metric and slightly different to H&H imperial dimensions...but it matters not as the difference is minuscule.</p><p>Now, here's the kicker and, my final word on this matter. Norma manufacturers Weatherby head stamped brass, it is excellent brass if used within it's limitations, which are two fold:</p><p>1) It is soft and does NOT take to max loads for very many firings, 3 is tops for it.</p><p>2) It is the ONLY brand made with webs as thin as .025" on the market. This fact makes it even more prone to early failure (read as primer pocket expansion) than nearly every other brand out there.</p><p>After sectioning multiple brands of brass, two stand out as the toughest on the market; Lapua and older Winchester. Both are HARD in the head and have thick webs, Winchester having the thickest web I have seen so far, above .060" thick in most cartridges of .473" and above head size. New Winchester brass is no longer the same quality unfortunately.</p><p>So, take this as you will, but I DO NOT use Norma/Weatherby brass to make or convert to other cartridges that require large fire forming steps.</p><p>I was given 20 boxes of Norma factory 22-250 rounds from a deceased estate, even that stuff is soft in the head...go figure it's around 30 years old, so Norma have never changed their internal structure on their brass.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2027247, member: 10755"] Again, I will mention case design. As most know on here, I own a pressure trace and I DO actual destructive testing such as sectioning cases to SEE web thickness, case wall thickness and even hardness tests. I also anneal cases and carry out the same tests to see what DIFFERENCE it makes, not only to performance but case longevity. Weatherby case dimensions are metric and slightly different to H&H imperial dimensions...but it matters not as the difference is minuscule. Now, here’s the kicker and, my final word on this matter. Norma manufacturers Weatherby head stamped brass, it is excellent brass if used within it’s limitations, which are two fold: 1) It is soft and does NOT take to max loads for very many firings, 3 is tops for it. 2) It is the ONLY brand made with webs as thin as .025” on the market. This fact makes it even more prone to early failure (read as primer pocket expansion) than nearly every other brand out there. After sectioning multiple brands of brass, two stand out as the toughest on the market; Lapua and older Winchester. Both are HARD in the head and have thick webs, Winchester having the thickest web I have seen so far, above .060” thick in most cartridges of .473” and above head size. New Winchester brass is no longer the same quality unfortunately. So, take this as you will, but I DO NOT use Norma/Weatherby brass to make or convert to other cartridges that require large fire forming steps. I was given 20 boxes of Norma factory 22-250 rounds from a deceased estate, even that stuff is soft in the head...go figure it’s around 30 years old, so Norma have never changed their internal structure on their brass. Cheers. [/QUOTE]
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.375 H&H Brass to .340 Weatherby Brass Conversion Question
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