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.
My only concern with a case such as the 45-70 would be consistant neck tension.
CR
It doesn't matter that you seat bullets to the same OAL you still have the bullet free bore. If my computer didn't crash several months ago. I had pictures of recovered bullets from ballistic gel that have rifling groove in bullets that are deeper on one side than the other . This proves that the bullet before it hits the rifling was going crooked, and accuracy suffered.
Just think about shooting 38 Specials then 357 Mag. in the same gun will they both be just as accurate ......NO.....
Also it best to have one caliber of bullet in case neck.
