I previously owned a 454 Casull single shot rifle. It shot well for the first two or three shots then suddenly shots dropped off the targets. That level of accuracy occurred at the same exact time my flinch did.
Lever guns feed from the tube up to the chamber using a carrier assembly. Geometry and balance of the carrier and cartridge length play a role in how well cartridges feed. I have found length matters and I have had to adjust the COAL of certain shorter cartridges to "balance" them on the carrier for reliable feeding. 45 Cowboy loads would not feed in my Marlin 1894 in 45 Colt.
