Have you ever thought about using foam? It works great in my .450#2, you do not have to weigh it and it is cheep and fills the case nicely. Where it is spongy it expands and fills the empty space well and does a great job of keeping the powder against the primer where it should be. The foam I use is the gray stuff like that found in some gun cases, you can get it at most upolstery shops. I cut it out with a punch and stuff it into the case.