celem
Member
Been bag - slug your bore and chambers, if possible. My Pietta chamber slugs at .450. I use .451 balls which load easier than .454 but still leave a nice lead ring when loaded.
Slugging the chambers is fairly easy. Remove the nipples then press a ball into the front of each chamber. It's a good idea to write or scratch a number on the ball and mark the cylinder with some tape so you can keep track of which ball came from which chamber. Then using a brass rod through the nipple hole poke them back out and measure around the ring you will find on the ball.