My first choice was a slug. Primarily it is a home defense load. I already load #1 Buck, but originally wanted a load that would double for deer. Here in Minnesota multiple projectiles are not allowed for deer, but a double projectile would be great for predators.
Right now I have Win AA and Rem Premier hulls on hand. I have no problem picking up a straight hull if necessary for my new load. Could be Federal Gold Metal, or whatever. I stock Win 209 and CCI 209M primers. Powder on hand is Green Dot, Blue Dot, IMR 4350, Alliant 2400, and Hodgedon HS-6. Wads are the white Win AA and shorter Reds.
The reason for the smaller balls, (even though I could easily go bigger) is that I figured that the ball, and wad need to squeeze through that choke.
So, even though I have a lot on hand, I am willing to acquire whatever I need to make up a functional load.
I have heard of a load that places a row (3) of #1 Buck, and the larger 58 or 60 caliber ball sits on top. With buffer, that would center the big ball.
To explain my intentions a little farther, I don't want to divide up the available energy of my shot into a lot of smaller balls. One or two big balls ought to do the job out to about 30 yards just fine.