03-14-2023, 08:42 PM
IMR4064 is to slow, that powder is to dense for the 6.5GRR case, so is H4895, Varget, A2495, other powders I have tried do not produce enough velocity due to case volume or burn rate are A2520, Shooters World Match Rifle same as 2520, A2460, H322, none of the powders will break 2400fps accept SWMR, but it has pressure signs @29.1gns with 120gn ELDM from my 18'' 1&8 barrel, 29gns SWMR no pressure signs but aved 2385fps, the best powder I have found for my 18'' and 24'' 1&8 barrels is AR Comp, both of my AR rifles are very accurate with this powder using the 120gn SMK's, I'm running 27.1gns of this powder and the 120 SMK's, my 18'' aves 2495fps my 24'' aves 2545fps, ES is 21fps the SD 7. and change for both barrels and accurate, the 18'' 1.25'' in a 20mph wind @200 +yds the 24'' 7/8'' same distance! can't ask for more than that from an AR platform, JMO