I have a general kind of question about underboring paint to barrel size. I have always had a freak kit or something of the sort and just matched the paint the best I could but errored on the side of being too big of a bore than too small.
I have found a lot of information about efficiency and fps and accuracy etc. My question is how far can you under bore safely before you risk a lot of paint breakage?
I.E - can you use a .684 barrel for a paint that is .688, .690, etc?
I apologize if this has been asked before, any help, information, or recommendations would be greatly appreciated.