I finally broke down and bought a proper bore gauge. It gives a very good indication of how the barrel is choked, however how they pattern proves how they throw shot. Not all my guns that measure the same throw shot the same on paper. Look at point of impact too even more differences. And like John said the load is another factor.
May be if I ran more patterns they would match up or perhaps not. There is a limit to how much testing I am going to do but measuring and patterning is important if you want to know what the gun is going to deliver on targets or game. I know I have changed some of my loading as a result of patterning
William
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