I shoot the 140 absolute, not the 143 HH, but I've shot it around 550 and 650 in breezes. Not real wind mind you but decent hunting-safe breeze and I was shooting it and the 180 ELDM at the same time. No discernible difference between the two in variable air at a right angle to the shot. it was the same wind hold essentially at 550. Obviously not a huge challenge but I was getting extremely consistent travel. Have you had a crummy time with wind holds with your 143 setup? Posted BC on the hammer site for the 140AH is on the nuts for me, .225 I think. Raw speed and an OK BC is a reasonable substitute for high BC so far in my case, but with your larger case I can't think of an argument to NOT go bigger. Why not? Fairly hoping for them to drop an HHT in the 155 family, that would be the easy button for my gun.