I loaded 10 rounds of 165gr .308 with TAC and 10 rounds of 168 gr with 4064 all in LC11 brass. Laid prone in the floor and shot them for groups at 100 yards out the door. The rifle likes the 4064 with 5 shots in one ragged hole. I decided to break out the Lapua brass Ive had sitting on the shelf for the last 4 years. I loaded 5 with the 4064. Four of the five shots were miss fires. There was a good dent in the primers, just not enough. I called my smith, first he said to set the bullets shallow and basically ram them into the lands. Fireform the brass to the rifle and they would be fine. He then asked the groups the rifle was shooting, and proceded to tell me to quit messing with it and just shoot the LC brass.