I am using a Lee .452 mold. 90234. It was actually giving me larger bullets and bullets that were not very round. So I started clamping the mold tightly closed with a hand spring clamp.
Now I get bullets that measure much more consistently and are closer to the marked diameter of the mold.
Perhaps if I were more careful with the metal I am using, I would get better shrinkage and the bullets wold be closer to .452.
I think I recall reading posts from others who say that their bullets come out of the mold a bit larger than the mold is advertised to produce.
I know I have found that to be the case with round balls.
My reading of history convinces me that most bad government results from too much government. Thomas Jefferson