I know 4350 works, but I only have 2 pounds left. Anyone shooting Superformance powder. I plan on running it with a 139 Scenar.
Why isn’t this a sticky?
Yes, I have been running the 139 Scenar with Superformance and been very happy with it. Found no data so mined a bunch of other pressure-tested 139-143 grain Superformance data, picked a smart starting load, and worked up. I settled on 45.9gr/Superformance under the 139 Scenar, Lapua SR cases with Fed 205M. (just got some CCI 41 and will try those too.) Averages 0.6 MOA at 2818 FPS with single digit SD. I am .020" off the lands in my 22" Christensen Mesa, but .005" off shot almost as well. I have heard these bullets aren't fussy about seating depth. I overlaid multiple groups I fired during the workup ladder from 45 to 46 grains and found it put all 21 shots into 1.18", so it is relatively insensitive to charge weight too, at least as far as POI is concerned, in that charge weight range.
