DPMS 308's typically do shoot well. One major thing is you REALLY ought to stop counting "clicks" and use "minutes" or MOA's..

this is what it would look like instead-

200- 1 MOA
300- 3.5 MOA
400- 5.5 MOA
500- 7.5 MOA
600- 10.75 MOA
etc, etc...

and instead of counting 43 clicks you spin it to 10 and 3/4 or 11 minus 1. Much faster and easier....