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.
http://www.jamescalhoon.com/primers_and_pressure.php