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Old February 15, 2013, 06:50 PM   #11
Join Date: October 26, 2009
Posts: 74
I use Federal 205M primers for .204 Ruger and .222 Rem with no problems.

Some years back I tried the Remington 6 1/2 primers (before the warning on the package) in .222 Rem using a starting load....pierced primer second shot and then again fifth and last shot. I never used those primers again.

Here is some interesting reading on primers and pressure, fairly old but relevant.
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