My dad's load is 200 AB at 3151 out of his RUM. We could push it faster, but it shoots so well, we stopped at this load. Unless the bearing surface is crazy with the 199 Hammer, I don't see why you couldn't get it to 3100. His gun holds this load just just a hair over .5 moa at 900 yards. I will take that out of an AB or really any bullet at that.