Originally Posted By: Tinker
Your .506/.507 number - that's the *groove* diameter that you are stating there, no?
What is the smaller number - what is the *bore* diameter of your rifle?

Hello Tinker,

Thanks for the reply.

Yes, that's the "groove" dia as measured on the chamber cast. Since its an odd number of grooves, I can't measure the the bottom of the grooves to get the "bore" dia of the casting, and I don't have any way to take a measurement of the barrel.

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