That's a rather light charge for 1000 yards - probably in the 2500fps vicinity. It's not likely to stay supersonic all the way to the target - and since bad things happen to good bullets when they slow through "transonic" territory, it's a region often avoided by long-range competitors.

To keep comfortably above Mach 1 (1125fps in standard conditions) you'll need a MV closer to 2650fps, a relatively easy task with a strong 03A3 and good commercial brass using IMR 4350 or 4831. The slightly better BC of the 178 A-Max or 175 MK will also help reduce wind deflection by cutting a bit of "lag time".

Here's relevant IMR-tested charge data with pressure results below the SAAMI 30/06 maximum of 60,000 psi (piezo) -

30-06 SPRG
REM. CASE; FED. 210 PR
SIERRA 180 GR. SPITZER BT
.308" DIA.; 24" BBL.; 3.325" C.O.L.
[Powder -- grn.- MV - psi (piezo)]
IMR 4350 54.3 2670 55000
IMR 4831 55.8 2700 57000
IMR 4831 55.3 2670 56000