Ed you replied to my post.”why for do you ax.” I believe you meant to write the word ask.
I ask because you are a licensed Gun dealer and publicly stated your standard of .090/.030. You have not mentioned the equipment or the method used for taking these measurements to assure not only the guns you buy are safe. More importantly whether it is it safe to assume that all the shotguns you sell have bores that meet your personal minimum safety standard?
Many of the members have shared the tools and methods they use. I think it’s a fair question, what do you use?