I note that 8-bore said he measured the choke with a small hole gauge, he did not specify a telescoping gauge. Assuming that he is using the term correctly the two are not one & the same. He may or may not be able to slide the small hole gauge down the bore, haven't tried it. I have done so with a telescoping gauge. I was able to procure a Used, 12" handle for my Starrett telescoping gauge set so this is what I now use for all my bore & choke measurements. Another method of measuring the bore would be to oil it well, but lightly & then drop a round ball for a .45 caliber MLer into the chamber. using a short section of about a 3/8" dowel drive the ball into the bore beyond the choke & then with the largest dowel you can get through the choke drive it back out. Measure tha ball diameter & you will have your bore measurement.
