Specifically for 223 / 556?
I got to shoot one of those ARs with a 12 oz can upper. Shot a full 12 oz can 100 yards and was all kinds of fun. I plan to buy the upper, and of course make my own blanks to propel them. My search dug up nothing. Not sure what I did wrong.
What powder? ( ( I assume a fast pistol/ shotgun)?
How to crimp the ends?
Thanks !