What cartridge are you trying to fireform? I have had good results using dacron, tissue paper or cream of wheat or corn meal. **NOTE**...When using cream of wheat and corn meal make sure they do contain salt** I have used Alliant Unique and Bullseye for powders. The powder needs to be fast burning. Depending on what you are trying to do, the powder weight will vary. I have used from 10-20 grains. The case will not be completely formed until fired with a good load with a bullet. I made a pipe/muffler to use in my reloading room for doing the this type of fireforming, it' s quiet and contains the mess.
On simple fireforming, I think just shooting a middle of the road load with a cheap bullet is the way to go, it does save time.


AA