RE: Small game with a muzzleloader
Yes it is possible but do not expect too much in the pattern department. The shot, moving up a rifled barrel will bounce against the rifling and makes kind of a mess of lead in the barrel. You will not get a consistant pattern at all. If you want to shoot small game, use a ball and load the rifle light. They normally shoot real well. I squirrel hunt with a .50 caliber loaded light and have shot many red squirrels.
If you want to shoot shot, then get a smoothbore, musket, or shotgun for black powder. Then you can shoot with a good pattern.
If you want to buy a Hawkins, get a T/C Hawkins in .54 caliber or a Renegade in .50 or .54 caliber. You can then purchase a Green Mountain .62 caliber smoothbore barrel that will fit right into the stock. All you do is dump 80 grains of powder down it, a plastic 20 gauge wad, and 100 grains of shot with an over the shot card to hold it all together. This load will kill rabbits, squirrels, and even turkey out to 25 yards. I even shoot roundball out of the .62 caliber smoothbore with good accuracy out to 35-40 yards. Next time out I want to try dumping a .58 caliber ball in a 20 gauge wad and see if that shoots better out of the smoothbore over the .610 ball I normally shoot.