I'm just starting to work up a load for my 260. Yesterday at the range produced some promising resutls. My tight group was using 130 gr. Swift Scirocco's, Nosler brass, Federal 210M primers, 45.0 grains H4831sc. I also tried RL-19 at the suggestion of Swift bullet company. I didn't get the groups I'm wanting. I'm going to try H4350 and Varget next.