Thanks, gentlemen. Starting to make a little more sense. It’s not just the threads, but also a substantial enough “backstop” or shoulder is needed.
Yes sir. It’s The shoulder you end up with, and also how much wall thickness is left between bore and minor thread diameter. If you thread a .22 cal 1/2” (which is standard practice), you have more wall thickness left than if you thread a .30 cal 1/2”. Most barrels over .22 cal are threaded 5/8”, but I’ve heard of .308s threaded 1/2” and as you mentioned kimber is threading some pretty slim barrels with smaller thread pitch’s.
Some gunsmiths are threading sporter barrels 9/16”, and coming up with solutions like the ones Scotty mentioned above.
Personally I want all mine threaded 5/8. I have another t3 lite 243 and am debating doing the 1/2” with adapter thing again or getting a CTR contour prefit already threaded 5/8” instead.
