Shot that 6.8 acog in off my back porch bench yesterday. Bolted on, was high to the left about 14 inches. After 4 three shot groups, had 1.5 inch pattern around bullseye. The ghost ring almost super imposes (touch bigger in size than 8 inch black circle) on those 100 yard small bore targets at 100 yards. I was using one of those green Caldwell tack driver X sand bags and I'm sure will improve with practice.
Ammo for 6.8 is tough to find in Alaska, waiting on reloading supplies and then will shoot her some more. I'm happy enough to finally have an acog on one of our AR's. Should be great when the caribou arrive this fall.