Here's what shoots excellent out of my 12FV in 223 and my 12BVSS in 223, both with 1/9 twist barrels.
For factory loads, nothing I've bought shoots better than American Eagle tipped varmint in 50 g. P/n AE223GTV. It's produced seasonally so there may not be any available during certain months of the year. When it is available, I usually buy several hundred rounds of same lot and use it as a bench mark load for sighting in scopes, barrel changes, and other testing and harvest the brass for hand loading. It's good for dozens of loads.
Second best is Australian Outback 69gr SMK. Good for deer and boar, varmints etc.
For hand loading, I recommend a load work up using 53 grain V-Max with it's excellent BC, IMR 3031 or 8208XBR and Federal Brass from the American Eagle loads, or for more discriminating tastes, Winchester brass while shooting recreational targets or varminting/hunting.
For longer range work, the 69 grain MK with 8208 is fantastic, or the 69 gr Tipped Match King (even better) with Varget. With the tipped match king, my scope adjustment between 100 and 200 yds is 1/4 moa. It shoots both flat and consistent. Both of those loads will shoot 5 shot groups in the zeros to threes, especially when my son (with his younger eyes) is behind the scope.
The American Eagle is a pretty consistent sub 3/4 moa load with occasional groups in the one's and two's. And I've got several targets with three shot groups in the mid zero's with that stupid cheap load. I swear, every time I do that it makes me want to chuck my loading press in the lake!
YMMV.
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