A few days ago I was researching something and came across a thread talking about shallow rifling... As best as I can recall a fella had bought a gun and liked it very much but when he inspected the bore-which perfect and mirror bright-he noticed that the rifling was shallow. His question to he forum was whether or not this mattered greatly? Among the answers was one that said (I'm doing this from memory) that if the gun was being shot with high velocity ammo(.22) then the shallow rifling was not only not a problem but was actually an advantage. This comment got no push back and seemed to have been accepted without demur.
Anybody know if this is, in fact, the case?