I shoot BP at game quite a lot here in the UK.
Here is my recipe and hints and tips.
85 grains of FFG, 1/8" card seated onto powder @ a minimum of 75lbs. Fibre or preferably Felt wad lubricated in Vegetable oil/Beeswax mix (allowed to drain off onto kitchen towel)1 & 1/8ozs of No 5 shot 1/16"overshot card RTO or crimp closure.
After the shooting wash out bores with Windshield wash fluid (neat)it really does move out the crud.


If you want to make your own wads you can use Builders Fibre board insulation, or the latest Fibre cartridges here are using compacted paper/ soft card, or if you want to be really good and serious punch out wads from Felt (hats etc.,)