A note about Swiss powder. Some guys have found that once the powder charge gets too large/high for a given projectile, they start to have hard dry fouling problems.

In my .50/90 Rolling Block, I used an OXYoke lubed wad under the bullet, with thin card between the wad and bullet. This allowed repeated shooting without wiping, same as with a lube cookie.

When testing hard kicking loads, I generally wear a PAST shoulder protector. It eliminates ALL recoil problems for me.