Re: REM. SPS Tactical
My sps-t .223 likes 75gr Amax bullets run long. Single load only long at 2.455 with 24.3 gr IMR 4895. I have taken these out to 1K with success, but they are lethal at 600yd. Because the barrel is just 1:9 twist, they need to be run hard to stabilize. Varget should do great as well. Start low and work up.
69 smk's work great as well, just not as good past 500.
YMMV-Rob