Firing pin protrusion on P-17 Enfield

[Bubba in Redcliff]

I have a fellows P-17 (BSA factory sporterized) that is piercing primers (ammo is Hornady Superperformance 165 GMX) Anyone know the correct maximum firing pin protrusion for the P-17?
Fired brass looks good, extraction was without problem. No damage/wear or cracks evident on bolt. Everything looks good other than the pierced/cratered primers.

Bubba

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