Sad to say Coosa, is that most S X S shooters don't even know if the loads they're shooting regulate in their S X S gun. I've found that lots of vintage S X Ss prefer a certain payload at a certain velocity, and loads a lot faster, lighter, etc. will NOT regulate, but will crossfire badly, or vice versa. I'm certain I have several that would not even come close to being regulated with 3/4 oz. loads, at any reasonable velocity.

May God bless America and those who defend her.