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Bore looks a little crusty
Whats the bore size on a 8mm? 311-312” ?

What ammo , action screws tight?
Hows head space ? Do you have a throat erosion gauge for mauser?

Anyway with out actually gauging the bore with pin/plug gauges say from .299” through .320” in increments of .001” you really have no idea where to end the counter bore. Ideally you want to counter bore to the tightest portion of the bore.

[QUOTE="mac1911, post: 7783941, member: 12137"] Bore looks a little crusty Whats the bore size on a 8mm? 311-312” ? What ammo , action screws tight? Hows head space ? Do you have a throat erosion gauge for mauser? Anyway with out actually gauging the bore with pin/plug gauges say from .299” through .320” in increments of .001” you really have no idea where to end the counter bore. Ideally you want to counter bore to the tightest portion of the bore. [/QUOTE]

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