My accuracy international rifles shoot .5moa with FGMM, <1moa with all quality ammo and probably < 1.5moa with anything else you feed through it.
My savage 308 shoots .75 with reloads that were painstakingly tuned for it, 1moa with FGMM, and very variable with everything else.
So what I have...
I don't remember the last time I've cleaned the bore of my rifle because it was dirty. I've put a patch through with a little bit of oil when I remember one has been sitting in the safe for a few years. Not sure if it's needed but feels harmless.