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Old November 13, 2012, 08:06 AM   #15
Bart B.
Senior Member
Join Date: February 15, 2009
Posts: 6,318
A 200 fps spread across those four primer makes seem quite a bit to me. Especially if the firing pin spring in the rifle used is up to specs and drives the firing pin hard enough into the primer to detonate it up to its specs.

However, if that spring is weak, then that much spread is possible. It's a known fact to long range competitors that weak firing pin springs cause lower muzzle velocities as well as increasing their spread
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