I ran the numbers through my Exbal program and the Beyond Belief's 7 STW, loaded to redline, with a 150 grain Barnes X boat-tail bullet, should hit the 1800 fps mark at slightly past 800 yards. Also, I agree with your 1800 fps minimum impact velocity; in fact, it may be a little generous. I usually figured 2000 for the speed at which a bullet is capable of making a permanent wound channel larger than its frontal diameter. Beyond Belief . . . .