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Is there such a thing, or are we talking about sensitivity of the priming compound
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It's the sensitivity of the priming compound. Keep in mind that there are some other differences in primers that can cause them to be harder to seat, etc.
Here's an example:
"CCI? No. 34 and No. 41 MILITARY RIFLE PRIMERS
Military-style semi-auto rifles seldom have firing pin retraction springs. If care is not used in assembling ammunition, a ?slam-fire? can occur before the bolt locks. The military arsenals accomplish this using different techniques and components?
including different primer sensitivity specifications?from their commercial counterparts. CCI makes rifle primers for commercial sale that matches military sensitivity specs that reduce the chance of a slam-fire when other factors go out of control*."
http://www.cci-ammunition.com/defaul...=10&prod_id=30