Well, the guy at the club that usually leaves me a crap load of brass just happened back again yesterday. And as usual, left a bunch of brass. This time, I thought it was 300BO and part of it was. But, there was a bunch marked WC 300Hamr. Didn't give it much thought until I started sorting it out this morning and noticed the 300 Hamr was a larger cartridge. Did a little searching and found the cartridge and a write up about it. Pretty impressive little round. Any of you folks shoot one? First though was having my bolt rifle rechambered to it for the extra punch it offers. Thought? Any of you have much experience with this round?