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Rifles, Reloading, Optics, Equipment
Reloading
Misfired Primers
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<blockquote data-quote="Mikecr" data-source="post: 343034" data-attributes="member: 1521"><p>I doubt it's a primer problem.</p><p>Not because it isn't possible, but because it's least likely.</p><p></p><p>Primer ignition is a tricky thing. It's more about impact speed, than impact force.</p><p>If primers aren't seated to a preloaded condition(crush), they'll seat further on impact </p><p>-slowing relative impact speed.</p><p>If your pin spring weakens enough in cold temps, or the internal(to bolt) grease thickens, drag can slow impact.</p><p></p><p>Yesterday turned sad for me when I discovered my firing pin catch had loosened, causing occasional misfires. Like you, the problem was intermittant, and re-firing would eventually set em off. The dimples left on mis-fired primers were plenty deep, but my pin was not pulled back normal distance, and that mean't slower strikes at these temps. A clue to this discovery was that mis-firing occurred only when the GUN got cold enough (I kept my ammo warm).</p><p>Anyway, I reassembled the bolt, locktite & a couple mods to prevent future failures,, back to the range and find velocities higher, gun out of tune, a weeks worth of seriously cold load developement invalidated... </p><p></p><p>Check your bolts</p></blockquote><p></p>
[QUOTE="Mikecr, post: 343034, member: 1521"] I doubt it's a primer problem. Not because it isn't possible, but because it's least likely. Primer ignition is a tricky thing. It's more about impact speed, than impact force. If primers aren't seated to a preloaded condition(crush), they'll seat further on impact -slowing relative impact speed. If your pin spring weakens enough in cold temps, or the internal(to bolt) grease thickens, drag can slow impact. Yesterday turned sad for me when I discovered my firing pin catch had loosened, causing occasional misfires. Like you, the problem was intermittant, and re-firing would eventually set em off. The dimples left on mis-fired primers were plenty deep, but my pin was not pulled back normal distance, and that mean't slower strikes at these temps. A clue to this discovery was that mis-firing occurred only when the GUN got cold enough (I kept my ammo warm). Anyway, I reassembled the bolt, locktite & a couple mods to prevent future failures,, back to the range and find velocities higher, gun out of tune, a weeks worth of seriously cold load developement invalidated... Check your bolts [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Misfired Primers
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