Lotsa, I settled on 3500+ (don't have my notes here) with a 55 gr NBT and under MOA accuracy with my Kimber Montana in 223AI (factory punched tube). I bested my TAC load in vanilla 223/5.56 by 50-100 fps with 55's and 77's.
I sold the rifle to a good friend of mine and he used my data and was within single digits on his chronograph. I have a 204 Ruger and a 22-250AI both in Montana's and didn't really need the 223 so I let him have it and really kinda regret the sale but it went to a good home. I also let him have my supply of Lever and figured I'd burn through the 2 jugs of TAC I had then make the switch for good, one jug of TAC left...
