H4350 with 140 Bergers in my 260.
I shot a 3 shot group @ 1020yds with the factory 147gr that measured 2.1", handed my buddy the rifle to my buddy, he shot a 2.4" group. Blew my mind. Then I couldn't find 147gr projectiles to load... I run H4350 and 142gr SMK. Don't know how to post pictures here...i can believe it.
YUP!!Staball 6.5 gives me about 100fps higher velocity than H4350 in my 7mm-08 at 0.8gr below max Hogdon load data. Two loads appear to have 5 and 6 fps SD, but I've not done enough testing to be sure. It measures great when throwing charges out of a volume measure so it speeds up loading time.
537 yards! thats some awesome shooting.Here's some shooting with the 142's. Bought that rifle as a donor, hate that thing...