13 gauge-one last try!
One final try! I didn't make a mold, but I sanded down a plastic tube and then smoothed the surface. It now goes easily into the chamber where the shell fits and then slides very snugly through the entire length of the barrel. So snugly in fact, it takes a moderate amount of pressure on a dowel rod to push the tube through the barrel, although it loosens up at the very end (choke?). If I were to accurately measure the diameter of this snugly fitting tube,(I think the tube is pretty uniform in diameter) would this be pretty close to a true bore diameter? I don't have a caliper (that I can find!), but rough measurements with a ruler read +/- 18 cm. If anyone thinks this would be an accurate enough method, I will try and locate a good caliper and get a more accurate reading. Thanks for your patience and ALL your help!!!
Last edited by Jack Hamner; 03-04-2014 at 11:04 AM..
Reason: add info.
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