Velocity spread at that range...and at 1000 yards for that matter...is not the big concern.
As it always has been, it's the wind...
And we all think it's tough at 1000...
07 FFL /Mosin-Nagant Custom Shop/Bent Bolts
Gun-Kote/ Cerakote Refinishing
Criterion Barrels/ Savage Re-Barreling