The Hogden site shows loads from 52.6gr to 56.0gr with IMR4451 and 130gr bullets. I loaded from 54.0 to 56.0 in .5gr increments with 3.30 OAL and 130gr TTSX and shot them with a M70FWT. MV is 15ft from the muzzle.
54.0 3005fps 1 1/2 INCH GROUP
54.5 3019fps 2"
55.0 3041fps 1 5/8"
55.5 3070fps 1 3/8" 5Sd
56.0 3075fps 2 1/4"
Not quite as good as the old H4831 in this rifle but tweaking things around 55.5gr would probably yield some accuracy improvements. The new powder didn't meter significantly better than 4831 but trickling every load is not a big deal as much as the 270 is shot.
I wouldn't think twice about loading up 55.5gr and going hunting.
