Cratered primers ?

Quote: I seen something on another reloading sight THR saying that low pressure will also cause cratering.


Low pressure allows firing pin to drive case forward enough to push shoulder of case back which increases headspace slightly. Primer, which is then not held flush against bolt face, is driven back against bolt face, getting a running start and is flattened when it contacts bolt face. Primer will show same signs as high pressure. The "tophat" is a classic symptom of excessive headspace since primer walls are unsupported when primer driven back a few thousandths.

Regards,
hm
 
Originally Posted By: dennydCCI 400's are soft primers, switch to 205's 450's, or rem 7'1/2's , keep the load the same and you will see what i am talking about, more than likely you will be able to up your charge of 335.

Definitely will help, good advice!
 
Originally Posted By: dennydCCI 400's are soft primers, switch to 205's 450's, or rem 7'1/2's , keep the load the same and you will see what i am talking about, more than likely you will be able to up your charge of 335.


I have been fighting similar issues with my 20 Practical. Dumb me, I was under the impression the CCI 400 was a pretty hard cup. Wish I had read this post sooner.
 
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