ButterBean: We have been down this path once before. I didn't say anything about Hammer bullets this time. I was stating what I know for a fact on bullets, that I have either used or have direct knowledge of the bullets and loading, which I was writing about this time. Most of these bullets were being used long before Hammer ever came along. I did ask for any info on studies that are out or coming out. I've been looking at wound channels from High School, which was in the early 60's going forward. Hammer bullets are fairly new on the market. I started reloading at age 14, which was 1962. I presently don't have rifle that the twist rate that will handle those types of bullets. I am having a rifle being built that will. I will go from there. Hammer bullets look to be good to me, and I like their design. I have Hammer bullets on hand waiting to use. I did used all copper bullets in the early 2000 and didn't like what I came up with in my rifle. I had to reduce the velocity, because of chamber pressure, and never could get them to group of what I wanted, which was about 1/2" or less at 100yd. Not all the people are shooting faster or higher twist barrels. From my understanding of copper bullets you need a faster twist rate barrel. So I am headed down that road. It will be interesting to see the outcome, but for now I will have to wait.