I did some wet phonebood testing with the 270gr gold dots a few years ago with a 5.5 inch SBH. I ran out of phonebooks before I got one to stay in the books, for recovery. We got up to 30 inches of wet phonebooks and at 1300fps mv, it seemed to never even slow down. There was a funnel shaped wound channel and about a 3 inch exit hole. Never recoveded a bullet.
Sixgun