Interesting concept, looks like a combination of Berger and Barnes technology at first glance. Does the round implode inward upon impact like a berger ? What kind of weight retention and penetration are you realizing ? For some reason unknown to me I have never had any luck getting Barnes bullets to group tight for me. I have tried multiple powder,primer,seating depth combinations etc. in 6 round test loads and never had any luck compared to Accubonds, Bergers, Swift A Frames, Trophy Bonded and Hornady's. I tried them in 240 Wby, 25-06, 243, 300 Win mag, 338 win mag, 375HH and 30-378 Wby. I have freinds that shoot them and like them, I ended up giving them away. Just figured they didn't like my guns. I had some success with them on 7MM Mag however the Accubond was tighter at 100 and 200 by about 1/2". I have often wondered if it was because of reduced bearing surface. Don't know for sure. What are your thoughts on this ? I am no bullet guru I just play around with loads until I find something that flies right then hunt with it, take a look at how it performs on game and try and recover as many spent bullets from carcasses that I can. Good luck with your Hammer Bullets- we can always use a better bullet !!