Bore sizes from small to big don't matter enough that what tw says won't get you in the ballpark. The question you really need to ask is does the choke I have do what I need it to do?
Fixating on some mythical number is meaningless - what do you get for knowing it? A maybe. There is a big enough range of numbers attached to any designation that you will have a seizure trying to rationalize them. If you look at something like Perazzi choke stamps for fixed choke barrels you'll not be happy. And just WTF practical difference is there in 3/8 - 1/2 - 5/8? Go on, take a guess.
Worry about how the gun performs not what it measures
JMO of course
have another day
Dr.WtS
