Were they over sized? Or could it have been a cylinder with way too much end-shake in it?
I’ve only got one revolver where this isn’t a problem at all. It’s a gas-seal Nagant. But that sucker has a trigger pull on it that won’t even measure on my pull gauge. :0)
My guess is they were or really soft. I mentioned he should have a smith take a look at the indexing, possibly polish/bevel the forcing cone, etc. if he was going to shoot cast exclusively.
Was a S&W 686. Never had that experience before or since.
I have one in 8 3/8” that shoots perfectly.
I have a number of Magna-port guns and always try to go “down to the end” of the firing line away from people to be considerate.