NOTE OF VERY STRONG CAUTION- just because a bullet is not lead does not mean that it could not kill you deader than 4 o'clock. In my callow youth, I was putzing around one weekend with a .44 Special, using WAX bullets. Primer only. Had my wheelbarrow stood up on its nose, paper target taped over the open "pan" of the wheelbarrow, which stopped the wax bullets when they went thru the paper.
Like a dumbass, I wondered what would happen with- oh, say, 2 grains of Unique and a wax bullet? Shot that taget at 15 yards. Punched a pretty .44 caliber hole in my wheelbarrow.