The 180 BST shot good with RL25 in my Ultra out at 1000 yards, under MOA at 500 and 1000 anyway. I only shot it a few times (50rds) The load was tested at 92.5gr, 3.66" OAL at 3190-3200 fps at 16 deg F.
22 MOA to zero at 1000 if I remember right. They shot very well with RL19 in my dad's 300 WSM
too. The 180 BT didn't shoot worth a hoot in either of them though. 1-1.5 MOA or so.