Reeder Custom Guns - Gary, how is best way to determine bore diameter on the 325

Smith acted like the did not know. I note that Montana bullets has several diff dia available in 45.

It's not a long range match rifle. It is.451 for jacketed and either .451 or .452 for lead. I would go .451 for both.

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Gary, how is best way to determine bore diameter on the 325