Good points, Renofish. There are alot of factors that affect how well these bullets perform. I also believe that barrel twist can make a big difference in how fast you can push them. One other thing that I'd mention about the possibility of bullets coming apart. How smooth the barrel is will make a difference as well. Some of the more inexpensive rifles can have a pretty rough bore right from the factory, and I've noticed that can cause issues too. I'm not sure annealing them twice is necessary, and I've found that derimming works better for me by not annealing them first. That seems to be a personal preference thing for swagers.