I've been using H335 in my Cooper .204 with excellent accuracy(in the .2-.3's) using Berger 40gr bullets. I've heard some talk that guys don't like H335 and prefer TAC powder. I'd like to know why the dislike for H335. I've heard TAC is a cleaner burning powder. Is that the only advantage? My groups don't warrant any change but I am down on my H335 supply so thought I might try some TAC if I get good info. Any constructive feedback is welcome.

From limited experience with TAC in a .223 loads you may get a more velocity before you hit a max load. In the .223 loads H335 maxes out at lower velocities than TAC. I can't compare them for .204 though. I have favorite powders but it always good to have a backup load incase you don't restock in time.

TAC make a smaller flash when shot out of a short barreled rifle.
You could also try some H-322 it works with them light bullets.

i wanted to try tac when h335 supplies were low .. thats been corrected .. VERY close powders - i use from 222 to 550 magnum