Awhile back my dad got a mold for a something or another. When we got the mold dad cast some up. The round ball came out of the mold at .690". what do you use a .690" round ball for? Easy!!!!!!! by a box of cheap low brass 12ga shells (preferrably federal), brake the crimp with a small flat head screw driver, open the shell up with a pair of pliers untill the ball can slide into the wad, dumb out the shot, slide in the ball and then use a shot shell press to recrimp if you have one and if not use a 3/4" socket. You will need to start the crimp by hand, But just until the socket fits over the crimp the push down. The crimp will be a little ugly but it works. if you are interested in trying the idea I will sell some for $0.15 ea, plus shipping.
The load works very well and does not kick that bad. I have used them in my double barrel 12ga shot gun that was intended only for shot and they shoot well.
DANIEL/BS JR.