It's funny, my hunting rifle, a 110 pencil-barreled plain jane 30-06 shoots cloverleafs with my fairly stout 150SST handloads, the first handload I tried with it, but I've never had the same luck with my heavy-barrel 10T in 308. What did help was installing an HS Precision aluminum bedded stock. That's when things finally started to tighten up considerably. I used a Boyd's Tacticool for awhile but it cracked so I can't recommend those. I'm really not a fan of the plastic bottom metal and bottom bolt release on my 10T.