I have tried and several others have tried to cut down cases in long chambers. Accuracy goes down hill. Just to long of a bullet jump.
That's why he's seating bullets to the standard 45-70 seating depth.
What pointer said about C.O's checking case length mirrors my experience. I was checked because I had a rifle and a busy body neighbor thought I was cheating using an illegal weapon. I was using my 358WSSM. The C.O. looked at my ammo and got a little excited when he read the headstamp and saw 25WSSM. It took him a minute or so to wrap his mind around the fact that the brass had been reformed to comply with the regulations of .357 or larger.
My only concern with a case such as the 45-70 would be consistant neck tension.
CR
