Originally Posted by
Bruce Cobb 1723V
It is a pretty simple process just using a dial caliper when you have a decent bore to start with and you have an ID to start with. At the end measure the thickness of the barrel at the groove. Do the same for the land, right next to the groove you previously measured. Subtract the 2 to get a groove depth. Multiply it by 2, then add your ID dimension. That number is the bullet size I would start with. This information is from a highly skilled, ex automotive senior designer.
Yep done that also. Works great on good barrel.
Just check several times at different locations to make sure the bore is centered in the barrel.
Many euro arms or lined barrels can be off centered. I have a few.
My Richmond carbine is way off, but it is a cut down Euro Arms Richmond.
MR. GADGET
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