Shoulder bump take 2. second attempt. New at this part...
consistency yes, target no...
My fireformed dimension is 1.465" My shoulder bump target is 1.462" for a semi auto. I backed my die off .003" and thought I had it but it moved again, after a couple minor +/-.001" adjustments I decided I wanted all my cases to be consistent if they werent exactly 1.462" and just ran with it at 1.460"... so .005" shoulder bump. The important thing here is these are all consistent at 1.460". Ive never achieved that consistency before. I think the reason is Ive never annealed before but the last time I tested annealing a few by hand and suddenly I was consistent (once I left my die alone), this time same result, consistency. I think annealing is the key the brass at the shoulder is softer and forms easy. Also whats really helping me is I'm using a Forster accu-ring on the die, it has marks every .001". It was a little tricky setting up where I could loosen the lock screw and turn the die without totally loosening the die losing "zero", when I lock it again. I'm still working on that part and think once I figure that part out I can get exactly the .003" shoulder bump I want.
Cases on the left fired 3x, cases on the right fired 2x. Fed FC21 brass.
consistency yes, target no...
My fireformed dimension is 1.465" My shoulder bump target is 1.462" for a semi auto. I backed my die off .003" and thought I had it but it moved again, after a couple minor +/-.001" adjustments I decided I wanted all my cases to be consistent if they werent exactly 1.462" and just ran with it at 1.460"... so .005" shoulder bump. The important thing here is these are all consistent at 1.460". Ive never achieved that consistency before. I think the reason is Ive never annealed before but the last time I tested annealing a few by hand and suddenly I was consistent (once I left my die alone), this time same result, consistency. I think annealing is the key the brass at the shoulder is softer and forms easy. Also whats really helping me is I'm using a Forster accu-ring on the die, it has marks every .001". It was a little tricky setting up where I could loosen the lock screw and turn the die without totally loosening the die losing "zero", when I lock it again. I'm still working on that part and think once I figure that part out I can get exactly the .003" shoulder bump I want.
Cases on the left fired 3x, cases on the right fired 2x. Fed FC21 brass.