Hey Skypup,
Went with the 68 BTHP with 25.5gr BLC-2 for the workup at long range. Turns out they have a trajectory similar to XM193 out of a 20" barrel, twice the downrange energy, and the kicker is they maintain 2.0MOA out to 400m even with intermediate 5mph winds and driving rain(That was slightly uncomfortable, but definitely worth it.)
Used the 3x TA33G-H ACOG with the 55 federals, and these new 68s. Awesome, I repeat awesome sight. With a scope cap on the front, you use it like an Eotech then pop it open for anything past 25m. Consistent hits on 12" plate out to 400m and contrast is great and so is brightness. I'll get my buddies camera and take some pictures and work up a better write up, but just to let you know this is the perfect combat optic for the 556, but not a varmiter. I'll be taking her out to 600m on Saturday and the 68s out to 600yds too. Full report to follow. :shock: