Got some 40/65 Winchester brass sized down from 45/70. Spent the day turning the rims down to fit the Danish Krag I have. I then ran the brass through the 8x58R die. All but one collapsed at the shoulder . Didn't matter if the brass was annealed or not. I then tried R-P 45/70 through the 8x58r and it sized no problem, so the dies work. Any guesses as to why the brass that has been sized to 40/65 gets wrecked ? This is my first attempt to try something like this and I'm stumped. I hate to toss all the brass I turned and start from scratch. Photo L-R:
40/65 case on the left, crushed cases, 45/70 resized to 8x58R.