Ed @ AHR says my 600 should be done next week. I am really looking forward to ringing it out. Bigdog, what loads do you use in yours? I'm looking at trying RL-19, H4350, 7828SSC, and Varget. I would like to use Varget to try to get to approx. 2100 fps. It's been my experience with the 600 JDJ that smaller doses of faster powder, within reason, reduce recoil and seem to be more consistant than heavier doses of slower powders. Has anyone else loaded for this round?