M/H cases
Trimming the cases is commonly done with a trimming die set in your press.
The case is pushed up into the die. Anything that protrudes from the die is carefully filed off. The old NDFS Co. used to make them. C&H die in the States will make you one.
Alternately buy and modify for length, a Lee rotary trimming die for a 45/70.
Be careful to recut only after neck re-sizing and especially if you have the requirement to full length re-size. This is because the the shoulder shape of the die internally, very rarely matches the shoulder shape of any given chamber. They vary extensively. So do your sizing and decapping first as this will affect the length of your case according to the shape of your die shoulder. In case I am not clear? A case will elongate, on firing, due to the reforming of the shoulder. It is common to see splits at the shoulder of cases fired in chambers shaped differantly from the die shape because of the constant reforming. Anneal often, right down and through the shoulder.
With Bertram cases @ £4:35 each. I just saved you a lot of money!!!!
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