Mike,

Here's some better diagrams below of the slug I made of my barrel (the drawing's from the other guy that has the same problem) I have measured from across one land to the depth of one groove and arrived at .349.

Add another groove depth and we're at .354. You wouldn't want to add a third groove depth.

If the groove depth is .005 that means the bore is actually .344 and the groove diameter is .359.










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