hartcreek wrote:
I have been reloading 30 years I crimp everthing yes even 9mm and .40 cal with a roll crimp. I get more consistant ammunition because with the crimp my cartridges develop a consistant pressure each and every time.
I find this strange, as I learned years ago, from multiple published sources, as well as knowledgeable individuals, never to roll crimp cartridges such as 9x19mm, .40, .45ACP, 10mm, etc., as they all headspace off the case mouth.
The edge of the case should be firmly contacting the headspace ledge at the front end of the chamber.
Technically, the only amount of crimp that should be given to so-called "straight-walled" pistol cartridges (yes. 9x19mm is technically tapered, but in that category) is just enough to remove the belling from the expansion die.