Originally Posted by
2152hq
The older standard English 'short chamber' in 12ga was 2 1/2",,but guns were cut with proprietary lengths by their mfg'rs.
Anyway,,does the final crimp die on the reloader bottom out during normal operation of the press? Or could the 2 3/4" die be simply adjusted back down to crimp the short shells?
If not and you do need to make up the 3" die into a short shell crimper,
If the material in the die is soft enough, simply hacksaw it off and then file it square and smooth. A slight bevel on the inside surface helps to guide the loaded round into the die. The lathe can make the final trim and bevel very easily.
The OAL of the final crimp die most likely isn't an exact spec if there is adjustment up and down on a threaded post for it. There usually is so the crimp can be fine tuned for the load inside it.
It's the crimp shoulder and a slight bevel to the top edge of the shell that that die produces. Nothing further down the side walls that would require a full length die though some distance is good for support of the case while the crimping is being done.