Jack,
I pretty much new what the answer was, just didn't know how many people referred just to what a chart tells.
In going to gun dealers they put the gage in, most of the times I have seen without the .700 ring for 12 ga. and read the pointer coming out and look at their chart and say mod/full, etc. Which to me just shows me that the barrels have not been honed.
I decided to make bore gages out of aluminum starting at .729, nominal bore size, didn't fit in one of my L.C.s', .727 fit in some down to .724 on the circa 1899 with Crown Steel barrels. (I added .001 to the final readings because as you know size to size will not fit.) Setting the bezel to .700 and inserting it all the way gave me +.022 (which is what I got with the bore gage .722) and withdrawing it gave me -.017, so a total reading of .039.
The indicator reading is nice and fast but I like the bore gages and telescoping gages to see if there is taper in the bores, which there was. Is this is what they called "Multiplied Choke Boring"?
