Sir - do not - under ANY circumstances - try and shoot a short-loaded bullet in ANY firearm.
ANY air-space between powder and ball give you that chance of shooting a literal pipe-bomb.
The least you will get is a bulged/ringed barrel.
The most you can get is a burst barrel, right where you will be holding it.
See the useful and petrifying little movie on Youtube about this very subject.
Whatever it takes, you MUST seat that bullet on the charge - shoot it, and THEN sort out the cruddy tide-ring.
tac