In another thread, a poster noted that CCI 400 primers tend to flatten easier than some others. Rather than hijack that thread, I decided to start another thread on that topic. Have others experienced it as well?
The only small rifle primers I have left are CCI 400s, and I've been somewhat alarmed at how flat they are after firing only moderate loads. No other visible pressure signs were observed. I'd never heard that they flatten readily until I read the previously mentioned post. In the old days, I'd work up loads using different primers and compare, but those days are gone.
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