Dang! I've had a pretty easy time getting my .204 sporters (a Savage, Ruger Mark II and Rem. 700) to shoot with a variety of loads. Usually use TAC but Benchmark and others have done well too. In all three rifles 32's and 40's (and usually 26's and 35's) all have shot close enough to the same POI at 100 to use them interchangeably. In my experience it's an extremely easy round to get to shoot, and not sensitive to different bullets or slight differences in powder charges. In fact the same changes of TAC have worked in all three.
I'd be looking at the rifle rather than dinking around with tenth-grain changes in powder charges.
My experience exactly�...
