I have a 12 FV .223 also mounted in an Oryx chassis with a Night Force Benchrest 8-32x56mm using a Sinclair F-Class Bipod and a Protektor rear bag and I find that combination performs really well.
The 73 gr bullets (ELD-Ms and Berger LTBs) so far are the most accurate bullet weights but the 77 gr bullets (SMKs, TMKs, Nosler CCs and Berger OTMs) and are a close second, followed by the 69 gr bullets (SMKs, Nosler CCs, $ TMKs).
I have pretty good results with the 73 gr ELD-Ms and 73 gr Berger LTBs with Varget. Both average 0.250 for 5-round groups at 100 yards.
I recently did some experimenting with seating-out the 73 ELD-Ms to 2.485 which didn't work especially well and increased the overall average with Varget from 0.238 to 0.250.
I should have known not to expect miracles when the stuff I was loading already worked great.
I have also had good results with the 73 ELD-Ms with N540 which averaged at 0.249 for 5-round groups at 100 yards.
Surprisingly, the 75 gr ELD-Ms averaged 0.375 with N140 and 75 gr Berger LDMs average 0.353 with Varget. That was a surprise and I have no explanation why the same type bullets just 2 grs heavier perform so poorly by comparison. There doesn't appear to be any different in shape, but my rifle just doesn't seem to like them.
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