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Rifles, Reloading, Optics, Equipment
Reloading
Primer Cratering Question
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<blockquote data-quote="boomtube" data-source="post: 209448" data-attributes="member: 9215"><p>Well, it's pressure that causes cratering but there is a more common reason than excessive pressure. If the firing pin is undersized for it's hole that leaves an unsupported ring around the pin, as can a weak firing pin. If the primer cup is soft and/or thin, either can cause cratering even at fairly low pressures. If the rifle is new I'd suggest you contact the maker and explain your story, let them take a look at it if they will. Such cratering is not, of itself, sereious but it may lead to piercing and that WILL damage the bolt face.</p><p> </p><p>It may be simplier to just change primers and see if you can find something with a harder or thicker cup that won't crater so easily. I once had to do that with a Weatherby Vanguard .243 but it stopped the craters.</p></blockquote><p></p>
[QUOTE="boomtube, post: 209448, member: 9215"] Well, it's pressure that causes cratering but there is a more common reason than excessive pressure. If the firing pin is undersized for it's hole that leaves an unsupported ring around the pin, as can a weak firing pin. If the primer cup is soft and/or thin, either can cause cratering even at fairly low pressures. If the rifle is new I'd suggest you contact the maker and explain your story, let them take a look at it if they will. Such cratering is not, of itself, sereious but it may lead to piercing and that WILL damage the bolt face. It may be simplier to just change primers and see if you can find something with a harder or thicker cup that won't crater so easily. I once had to do that with a Weatherby Vanguard .243 but it stopped the craters. [/QUOTE]
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Primer Cratering Question
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