I'm gonna have to try it your way, J.E.I guess I'm old school and don't believe in putting anything in a firearm except bullets and powder so I fireform using a medium powder charge listed for the cartridge. I form all of my wildcats this way, especially those that wont head space and If properly loaded get very good accuracy and velocity with perfectly formed cases. (I don't want to have to fire form them twice to get the full case capacity of the new case).
These fireform loads can be hunted with and fireformed at the same time. Case stretch is also held to a very minimum. (Less than .004 to .006 thousandths). I feel that If accuracy and velocity are good enough to hunt with, there is no wasted/shortened barrel life. Example: fireform loads for my 30 Texan using 180 grain bullets had a velocity of 3161 ft/sec and group size was just over 1/2 MOA (.534 5 shot) so I will be hunting while fireforming, and getting use as this process is taking place.
There are many ways of fireforming as seen buy the number of ways posted. This is just another and my preferred method. I just don't like corn meal or cream of Wheat in my rifles, just like I don't like gun powder in my cornbread or cream of wheat. Ha Ha.
J E CUSTOM
I'm gonna have to try it your way, J.E.
My last outing fire forming wasn't as successful as I last remember.
I scratched around on the internet and found what looks to be a good fire forming load for the .223AI
I should'a learn't from ya when I first asked. ;-}