I have a 9.3×64 Brenneke and can push them at around 2650 fps. Has anyone used them on heavy game . How well did they penetrate? My rifle has a 12" twist.

If your referring to GS Customs or North Fork banded flat point solids, Ive shot a lot of Cape Buffalo, some PG for the pot, A Hippo, and one elephant with them, plus some other stuff I don't recall off hand...Bottom line is the kill better than RN, and as far as I can tell the drive in a straight line and the few Ive recovered showed some slight mushrooming on occasion but they all performed as advertised, maybe better...I begged the bullet companies for years to make a flat nose bullet for the big bores but to no avail, I felt they would work as well in big bore rifles as they did in Elmers handguns. They told me flat nose solids were unneeded until I found GS Customs and North fork, they listened and we were on the same track...I got to test them in the field and never looked back, and of course all the other nay sayer companies jumped on the band wagon. I remember the lovly Mrs. Connie Barnes told me that was ridiculas, they simply wouldn't sell. She had a way about her!