They just arrived in the mail today. I purchased them for my 257 Weatherby, 103 grains, it will be interesting to try them out. From what I researched, they don't resemble Barnes non-terminial performance; they actually fragmentate by losing their pedals and other pieces of copper, and then the main shaft of the bullet go's straight through. Also, I read and heard that they are accurate and fast. Anyone out there with Hammer bullet experience?