Rolland, I have a wonderful Hollis 12 bore with "invisible" rifling, which was made for the Duke of Connaught. The older than me Gentleman I purchisd it from gave be a great load. It is :
26 grains 4756
Rem. R12L plastic wad
1/2 felt wad
1/8 cardboard wad
748 grain wasp waste lead bullet.
I use this load in brass or plastic shells
The gun is a delight to shoot, accurate with just enough recoil as it is light, but great for deer and hogs