Secret to lowering es and sd on a ar10?

[bushmotornv]

I'm seeing the same thing with my .260 Rem AR. Mine is all top notch components and a Bartlein 24" but... it shoots.

Everything has to be just right. I managed a .339 MOA @ 200 yards 5 shot group but still see SD/ES higher than in the bolt guns. I think it is the nature of the beast so to speak. I've tried everything - neck turning, weighing brass, better dies etc etc but....

So now I am just shooting and enjoying!

How are your groups?

My most accurate load is 39.5gr of H4350 Sierra 140gr Game King seated to 2.800 COL . 2574 FPS,SD 1.4,ES 6-9 fps. Average group size is.600"@200 yards.X-Caliber 24" HBAR contour,260 Rem chamber.