Home Forums Reloading Big Game Rifles .257 Roberts fav's

I've been shooting IMR 4350 in a Ruger UL 20" 257 Roberts. The standard 46gr IMR 4350 with a Nosler 100 Partition. RP case, BR2 primer, 2.912 OAL, .002 off the lands. Average 3030fps at sea level 40 degrees using a ProChrono Digital chronograph. I'm no target shooter, but can do 1-1 1/4", 3 shots@ 100yards.

Recently changed over to H4350. Same bullet, case, primer and OAL.

3 shot Average fps, @ 35 degrees sea level. Same ProChrono Digital chronograph.

46.5 = 3060 average fps.
47.0 = 3105 average fps
47.5 = 3164 average fps
48.0 = 3171 average fps

Settled on 47.3 @ about 3135fps for the best accuracy that I could do. 5 shots into 1-1/8" @ 100.

Worked up from this data......