Thread: 250-303

Originally Posted by bearfighter

I wasn t aware there were variants
I have lee dies and had to bump the shoulder down 50 thou for the case to chamber

so HOW did you bump shoulder down 50thou????50 thou from what? or are you saying when fired the cases have grown so much you needed to make them 50 thou smaller than the after fired size??? if your dies are hitting base....thats your saami spec size give or take a flyshit..so if indeed your fired case is way bigger.... set your die to only move it just enough to chamber again.

Mickey Duck. never fired a round through the gun, we run a 303 case through the 250-303 lee dies and the case would not chamber. I believe we then used a 257 Roberts sizer die to bump the should back until the case would chamber in the gun. we trimmed the neck to the same length as the original specs.we then loaded 2 rounds with light loads and fire formed them to get the actual chamber dimensions . We then removed 50 thou from the bottom of the die, rounds will now chamber just need load information for shorten case