My 20 Tac has a 10 twist and, so far, only shoot 32 grains. I'll try 40 grainers when I find some time.I would say they are about the same out to 250-300 yds. After that, the 204 starts to fair better if there’s any wind. I shoot 32 gr Vmax in both, and the extra 400 FPS out of the 204 makes a big difference. I also use Leupold VH reticles on most of my doggin rifles, so it’s easy to move from one to another as the yardage increases with shots fired in one spot; Just a slight mental adjustment for windage and elevation holds and your hitting with different ballistic.
I use Nightforce scopes on most of my rifles---I keep a chart to tell me how many clicks I need for a given distance.
I sure love the flat trajectory of my 20 Tac---the topography of my gopher fields limits me to about 200 yards and the Tac is ideally suited for that distance. My 223 has been set aside for the time being.
Happy shooting
Bill