I have some 30-40 Krag brass that I need to form to 40-70 SS. I have about 90 cases already formed by the previous owner of the rifle. I have already blown out the case mouth to .40. Now how do I stretch the brass to 2.495 to 2.500".
Do I keep firing the brass with a media such as corn meal with about 7-10 gr of a pistol powder? Am interested in all opinions. I do not have a lathe as some suggest I need to stretch the brass with.
Also, what about the same for 303 British? I know that 303 is shorter than 30-40 krag. Interested in all opinions.