Why do SXS barrel bore diamiters vary?

[Paul Harm]

I don't believe back in the day 5 or even .010 difference in bore diameter made a big difference. It's just now, many years latter, that many of us want to believe everything was kept perfectly the same. Cut stocks or barrels - barrels too thin - yea, that makes a difference. A couple of thousands difference in bore diameter - not.

[Double Lab]

Bill is right, .010 difference in barrel ID probably means the barrel has been reamed. I say probably in that I understand Parker factory would clean up barrels at customers request. That would'nt be a deal breaker for me. I agree with Paul; cut stocks and barrels along with thin, less than MBWT, is a concern.