with Varget you would want a heavier bullet to maximize that powder. Others should post on this too but I would not use any of that Varget until I got a 62+gr bullet to try
I am going to do some more testing for accuracy soon with my AR. Up until now I really just worked up plinking loads and have only tried 3 different bullets. 60 gr Vmax, 68 BTHP, and the 55 FMJ dogtown bullets from MidWayUSA.