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Rifles, Reloading, Optics, Equipment
Reloading
300WM - Factory ammo "overpressure" signs
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<blockquote data-quote="entoptics" data-source="post: 1956575" data-attributes="member: 104268"><p>I was under the impression this is not his rifle. Buying 3 pieces of new brass isn't generally an option, and unless I'm mistaken, he already has a "perfect" chamber cast. A hot load isn't gonna expand to bigger than the chamber (or if it does, there's usually some subtle signs of it, like searing hot gasses, shrapnel, blood, etc).</p><p></p><p>Anyway, in my experience, the "simplest" is what the OP already has. A piece of new brass expanded 0.018", had a pancaked primer, and incipient case head separation. To me, that's indicates that when things hit 60,000 psi or so, the front of that brass went forward more than it should, and the back went backward more than it should.</p><p></p><p>I suppose it is possible that the Hornady factory ammo is bad, with an incredibly short belt to shoulder, leading to a "false" sense of excess headspace, but you could figure that out by measuring some other new brass, without the need to fire 3 pieces of it 1 grain above minimum.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1956575, member: 104268"] I was under the impression this is not his rifle. Buying 3 pieces of new brass isn't generally an option, and unless I'm mistaken, he already has a "perfect" chamber cast. A hot load isn't gonna expand to bigger than the chamber (or if it does, there's usually some subtle signs of it, like searing hot gasses, shrapnel, blood, etc). Anyway, in my experience, the "simplest" is what the OP already has. A piece of new brass expanded 0.018", had a pancaked primer, and incipient case head separation. To me, that's indicates that when things hit 60,000 psi or so, the front of that brass went forward more than it should, and the back went backward more than it should. I suppose it is possible that the Hornady factory ammo is bad, with an incredibly short belt to shoulder, leading to a "false" sense of excess headspace, but you could figure that out by measuring some other new brass, without the need to fire 3 pieces of it 1 grain above minimum. [/QUOTE]
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300WM - Factory ammo "overpressure" signs
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