Spent the day out in the desert trying to figure out which load is going to shoot in my sendero 300RUM. The two powders I have been trying are Retumbo and Ramshot magnum. The bullets I have been using are berger, 175gr, 185gr, 190gr and 210gr. So far I like the way the 185's shoot. My two best loads were 96gr Retumbo and 97gr Retumbo. But they were not that good, nothing to brag about. I started out at 100 yards and then moved out to 200 yards. I had found a max load of 100gr of Retumbo and that seemed to throw the bullets everywhere. I think I will play a bit more with seating my bullets closer to the lands, but not too close that it makes my rifle a single shot. If that doesn't work then I guess my gun doesn't like berger bullets and its back to Nosler accubonds. I never had these kinda problems with accubonds with my wifes 300SAUM. Any advice from the guru's out there?????