Buy a .219" inspection pin from a machine shop tool house $3.10. McMaster Carr etc. (http://www.mcmaster.com/#plug-gauges/=n1rjjo)stick it in the muzzle. It shouldn't go in if the muzzle is in good shape but many go in apx 3/4" and stop. The bore land to land should be .218" If the muzzle is looser than the rest of the bore it will not shoot short bodied bullets well.
69s, 75s and 77s will shoot better than the lighter bullets.
Some barrels are made improperly and have a swelled muzzle new, others are cleaned from the front and the grit on the cleaning rod wears the lands down.