Off-Centre Firing Pin's Effect On Accuracy

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Off-centre striker hole in SIG P226
Off-centre striker hole in SIG P226

Q: I noticed that the firing pin indentation on the primers of cases fired in my Savage .22-250 are not perfectly centred. Why is this? Does it have any effect upon accuracy?
Douglas Waters

A: The firing pins of most rifles strike the primer of a cartridge slightly off-centre. This is due to the fact that when making rifles on a mass-production basis, it is virtually impossible to end up with the receiver, barrel, chamber, bolt and firing pin tunnel all in perfect alignment. The misalignment has no effect on accuracy so long as it is not extreme.

Off-centre primer strike
Off-centre primer strike
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