Daryl,I've been cutting once used AA winchester hulls.
I cut them down to 2.466 or just under 2 1/2 inches.
Cut the petals off a standard wad.
Make a donut shaped 1/2 inch wax impregnated saddle felt wad for the ball to sit on
Then roll crimp.
I've had no problems with the ball being loose.
I'm still working on different powders however accuracy is acceptable at 65 yards.(4inches)
Al