What kind of primer are you using?
Read an article the other night about a the 22 Hornet and the guy was using 2400 powder. He had switched from Rifle Primers to Pistol Primers and got better accuracy (J bullets).
I remember a long time ago working a load with 2400 and LP Mag primers - the accuracy just wasn't there, remembered what Elmer said about 2400 and Mag primers and switched to regular LP primers and my groups shrank to what I expected.
Wondering if it could be the same with Larger Rifle and Large Pistol primers in the 308 win loads.
Anyone out there using LP primers in the 308 Win?