FWIW; I've found that 150 BT's and AB's shoot very similar in my .06. I'M getting 3000 to 3036 FPS from 58.5 gr RL16 and WLRM primers = 0.77 moa at 100 yd when seated .020 off lands. Loaded some at .015 off t see if it tightens up. I like the temp insensitivity of RL16 compared to H4350. However H4350 produces better accuracy by about 25% smaller groups. But a 61 gr load H4350 that works great at 60 degrees gets really hot when the TX summer kicks in causing barrel harmonics to fluctuate and downrange poi moves.