So you trim some off the die or shell holder to Bump the shoulder back? And use a feeler gauge to set the amount of shoulder bump? This is done after annealing..?
Again, I have never found it necessary to grind the bottom of the die and or the top of the shell holder. I have found it impossible to bump the shoulder of the case back, I have bump presses and non bump presses, I am the only reloader on this forum that knows the difference between a cam over press and a non cam over press, the cam over press is a bump press. And then when it comes to adjusting a press, there is one set of instructions for the cam over press and another set of instructions for the non cam over press.
And then there is reducing the length of the case from the shoulder to the case head. I size cases for short chambers by raising the case head off of the deck of the shell holder, when the case has more resistance to sizing than the press can overcome I increase the presses 'ability to overcome the cases ability to resist sizing by placing a shim between the case head and deck of the shell holder. I have RCBS shell holders that will allow for a .010" feeler gage between the deck of the shell holder and case head.
And it appears I am the only reloader on this forum that understands case forming. I find it impossible to move the shoulder back, it is not something I discovered by accident; when forming cases the newly formed cases has artifacts of the old parent case, the old shoulder does not become the new shoulder 'MEANING!' the shoulder did not move.
Annealing: I did not invent and or build anything, I did put a few factors/rules together, I did not discover them because all of the factors/rules already existed. What I did was apply the factors/rules to an annealer I made, with all of the gigs of space used up on the Internet about annealing I have not found anything that would cause me to change the design for improvement. Again, I took a few of them to a gun show and placed them on the table, no one recognized the tools as annealers and no one was curious.
This is done after annealing..?
Most of my annealing has been done on formed cases; when annealing formed cases it is recommended the case be heated down to the position of the new shoulder; so? The reloader should decide if they are going to guess where the new shoulder is going to be located or after forming the case. And then there are those cases that have to much resisting to being formed and or sized; I suggest anneal first then form.
F. Guffey