Originally Posted by dumbear
How is it possible for a rifle bore to be slightly tighter at one end. I have a TC .50 cal muzzleloader that is slighter tighter towards the breech end than at the muzzle.
Normally they are not. But when they are (Within specs.) the barrel maker marks the tightest end for the muzzle.We are talking about 1/10,000 of an inch, the normal maximum allowable.
This allows the bullet to stay in contact with the barrel all the way down.
If it is smaller at the breach end this is not conducive to good accuracy.
J E CUSTOM