I took the new 6.5 x 284 / 7.5 twist / 26 inch barrel to the range to do first time 3 round group developments from 48 to 49.5 grains of H4831SC with the ELD X 143 grain bullet and Fed210M. Velocity is pretty low,,,2750 with 49.5 grains of powder. Book says max is 49 grains while another says 51 grains. I am aiming to increase the speed close to the 3000 fps mark. A slow node was found using 48.3 grains, and 2650 fps average. The OAL is 3.120" and .005" from the lands. I dont see any pressure at all. I will do a ladder to find max velocity. 2750 fps ave with 49.5 grains is the highest speed so far on the first trip out there. I hear some guys pushed it to 52 grains or around there.
What velocity are you guys getting with H4831SC and 26 inch barrel?
What velocity are you guys getting with H4831SC and 26 inch barrel?