ive played some with the lighter bullets but found if you push them to fast they arent very accurate. I think if you stick around the 2400 to 2600 fps range you will find the best accuracy. with a speer 110 grain spire-sp and 43 grains of H4895 ive found to be a very accurate in my 308 and also makes for a great medium range (under 200 yards) varmint load. good luck