Back around 1961 I sort of got into the fast draw craze. Decided that while it was fun, paying for repairs on Colt revolvers was getting out of hand. One phase of the game though was the wax shoot and walk and draw wax. I had to enlarge the flash holes on the brass so that the primers would give sufficient push to the wax and keep the primes from backing out and jamming the gun.
IIRC, most of us used parafine canning wax for bullets. I don'tknow if crayons would work but tere is no reason nt to try.o
Paul B.