If you are running 26-28" barrels, you should be able to get around this:
286 grain Hornady SP @ 2100-2200 fps
270 grain Speer SP @ 2200-2300 fps
250 grain NBT @ 2200-2300 fps
232 grain Norma Vulcan/Oryx @ 2500-2600 fps
193 grain S-B SPFN @ 2800-2900 fps
The Norma 232s started at 2550 would be at about 1450 at 400.
The Nosler 250s at 2300 would be just under 1700 fps at 400.
The 270 grain Speer would be just over 1400 fps (started at 2200) at 400.
The Hornady 286 would be down to about 1500 started from 2200.
The FN 193s would be likely your worst choice for trying to stretch to 400.
