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Rifles, Reloading, Optics, Equipment
Reloading
Making your own 7LRM brass
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<blockquote data-quote="P7M13" data-source="post: 2890938" data-attributes="member: 94154"><p>Update:</p><p>Had four more pieces of Gunwerks (Hornady) 7LRM brass fail after their third firing -- two neck splits, one start of case head separation, and one body split just below the shoulder/body junction. My Hornady pieces converted from 375 Ruger are lasting longer....</p><p></p><p>I recently bought some Peterson Cartridge 300 PRC brass and converted five to 7 LRM. Lost one in the conversion, which is why I'm posting.</p><p>I've always said, 'use lots of case lube', but need to strike that. In this batch of conversion, I started by cleaning out the die and mandrel and annealing the brass. Then I took clean brass, gently wiped on lube and then started the sizing process. </p><p>Peterson brass, though softer than Lapua, is much tougher than Hornady. It came out with dimple folds. Crap. What I noted was that the dimple folds showed lube like the classic "too much lube" shoulder dimples. </p><p>Responding to that input, I would advance the die a small amount, back it out and wipe any lube off the neck and shouylder, rotate ~60° then move it up again another few thousandths. I did this like five or six times to get a beautiful, finished piece. I then trimmed the case to length. </p><p>The finished piece fit in my chamber. What I didn't check was whether a loaded round did. Case in point, two of the four pieces didn't fit due to the neck web thickness needed to be turned to fit.</p></blockquote><p></p>
[QUOTE="P7M13, post: 2890938, member: 94154"] Update: Had four more pieces of Gunwerks (Hornady) 7LRM brass fail after their third firing -- two neck splits, one start of case head separation, and one body split just below the shoulder/body junction. My Hornady pieces converted from 375 Ruger are lasting longer.... I recently bought some Peterson Cartridge 300 PRC brass and converted five to 7 LRM. Lost one in the conversion, which is why I'm posting. I've always said, 'use lots of case lube', but need to strike that. In this batch of conversion, I started by cleaning out the die and mandrel and annealing the brass. Then I took clean brass, gently wiped on lube and then started the sizing process. Peterson brass, though softer than Lapua, is much tougher than Hornady. It came out with dimple folds. Crap. What I noted was that the dimple folds showed lube like the classic "too much lube" shoulder dimples. Responding to that input, I would advance the die a small amount, back it out and wipe any lube off the neck and shouylder, rotate ~60° then move it up again another few thousandths. I did this like five or six times to get a beautiful, finished piece. I then trimmed the case to length. The finished piece fit in my chamber. What I didn't check was whether a loaded round did. Case in point, two of the four pieces didn't fit due to the neck web thickness needed to be turned to fit. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Making your own 7LRM brass
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