Hey guys, long time reader, less than occassional poster. I need some help. I have an awesome 180 Barnes TSX - Retumbo load for my Weatherby Accumark, but I was wondering if anyone has any favorite loads for the 200gr Sierra MK. I also have 10+lbs of IMR 5010 but can't seem to figure what a good starting and max load should be. IMR will not comment other than it was MilSurp for the 50BMG and I know I can't do a head to head with H5010. Is it safe to start with that load data and work up.?