I've honestly never heard that one. I do know that the chamber in my 52 barrel is not as tight as my K frame revolvers. I had some 148 HBWC's years ago that for some reason afer reloading had a slight bulge near the base of the case. Some were impossible to load in a revolver, but I could fire them with no problems in my 52 so I could get the brass back. I stopped using those RCBS dies...switched to Dillon and haven't had that issue again. So, now that you brought this up, I could see that maybe my 52 could use an unsized fired case from a revolver, but...I reload for a fleet, not just my 52 so I'll resize my cases.