Your numbers are right on. The PTG bolt head is too deep. I just measured 3 PTG BH's and 5 Savage BH's for you.
The PTG's BH's measured: SPC -.115", 308-.116", WSM .115".
The Savage BH's Measured: . 223 -.114", .115, 308-.111", .115", .115"
Most smiths shoot for .125"-130" protrusion.
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