Just so you know, in case a bullet finds its way down your new barrel without the benefit of a powder charge beneath it, there are 2 easy ways to remove it. I know it sounds dumb, but it happens to just about everyone eventually.

Easiest may be the bullet worm which screws on the end of a ramrod. Just push against the bullet and turn clockwise until the thing screws into the lead, then pull it out.

The other way is to remove the nipple and push grains of powder into the breech through the flash hole. Takes a few minutes but it doesn't take all that much. Replace nipple, cap and fire at a target a few feet away.