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Pressure question?
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<blockquote data-quote="CatShooter" data-source="post: 133556" data-attributes="member: 7"><p>If all other signs are OK, then don't worry.</p><p></p><p>I have a new Sendero-II and the primers show "gap cratering", which is different than pressure cratering.</p><p></p><p>Pressure cratering comes from the pressure pushing the pin back and pushing primer metal into the hole. This type is identified by sharp walls on the outside of the crater, and a sharp feeling as you draw your finger across the primer.</p><p></p><p>Gap cratering is caused by a firing pin hole that is much larger than the pin itself, so when the pin is down in the fired position, there is a ring of space around the pin... or "Gap".</p><p></p><p>When the round is fired, the pressure forces the metal into this space, but does NOT puch the firing pin back.</p><p></p><p>This kind of cratering is typified by craters that have a "soft" look, like the metal melted into the space... there are rarely sharp edges, and they appear even with light loads.</p><p></p><p>My new Sendero has this, plus two new XR-100s showed the same signes... even with light loads.</p><p></p><p>It is because Rem is drilling the bolt faces with drills that are too large.</p><p></p><p>You can have the bolt "bushed and redrilled" for a better fit, and I did that on one of the guns, but it was a waste of money ($70) and time... he didn't do a clean job, and I picked up 5 thou of head space in the process /ubbthreads/images/graemlins/frown.gif /ubbthreads/images/graemlins/frown.gif.</p></blockquote><p></p>
[QUOTE="CatShooter, post: 133556, member: 7"] If all other signs are OK, then don't worry. I have a new Sendero-II and the primers show "gap cratering", which is different than pressure cratering. Pressure cratering comes from the pressure pushing the pin back and pushing primer metal into the hole. This type is identified by sharp walls on the outside of the crater, and a sharp feeling as you draw your finger across the primer. Gap cratering is caused by a firing pin hole that is much larger than the pin itself, so when the pin is down in the fired position, there is a ring of space around the pin... or "Gap". When the round is fired, the pressure forces the metal into this space, but does NOT puch the firing pin back. This kind of cratering is typified by craters that have a "soft" look, like the metal melted into the space... there are rarely sharp edges, and they appear even with light loads. My new Sendero has this, plus two new XR-100s showed the same signes... even with light loads. It is because Rem is drilling the bolt faces with drills that are too large. You can have the bolt "bushed and redrilled" for a better fit, and I did that on one of the guns, but it was a waste of money ($70) and time... he didn't do a clean job, and I picked up 5 thou of head space in the process [img]/ubbthreads/images/graemlins/frown.gif[/img] [img]/ubbthreads/images/graemlins/frown.gif[/img]. [/QUOTE]
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