I tried Varget, RL15 and H4350 in my .260 Ti and found no joy. Finally settled in on 47.5g H414 and 100g Nosler Partition, CCI 200 at 3150 fps. Runs 1/2"- 3/4" for 3 shots if I let the barrel cool. H414 was listed in several articles as a top powder for light bullets in the .260.
