Ace bandages, wrist splints, their health plan card, and extra batteries for their hearing aids.
Gun Tests recently reviewed the .454 Casull. They had great difficulty firing any of the three revolvers tested, due to the savage recoil. This was with the use of a padded rest they could use standing up, to allow the shoulder to absorb part of the recoil, and PAST shooting gloves. The Ruger had functioning problems, the Freedom Arms broke in the Ransom Rest, but the Taurus performed well, but was not pleasant at all to shoot.
If you need a cartridge of this class, you, IMHO, really need a rifle. Walt