take a look at the BC of a 53g Hornady V max, it is better than the 60g V max and is perfect in the 12 twist.
Also, the 52g Sierra Match and the 53g Sierra match are always in top picks due to their match grade quality jackets. The Sierra 55g BTHP and 55g spt bt also have match grade jackets.
The 12 twist is a very versatile twist. Of all the BC's of the lower weight bullets, the 53g V max is by far the best, worth saying again due to the fact that not many know it. The 53g V will NOT stabilize in a 14twist, no matter how fast you push it.
I also have had really great luck with the 50 and 55g Noslers that produces tremendous accuracy. The 55g Combined technology bullet with a max for that rifle load of win 760 out of a 26" 22/250 VSSF produced bug holes at 100 yards, 3850 fps and 1 1/4" groups at 400 yards using an 8-32x Burris Black Diamond scope.
Many powders will produce exceptional accuracy in a 22/250, Varget was the worst that I tried of all of them.
Good luck