I'm of a different opinion, Sam. To control muzzlejump, I brake all pdog rigs, regardless of chambering. I've got a .204 Ruger in the works being built, and even it gets a brake. With a braked 6mm Rem pushing 75 grainers ~3700 fps, I can still spot my misses. The .223's with 40 grainers at the same speed barely even shiver at the shot.
I heavy up on magnification regardless of chambering. Peering at pdogs at 400 yards for 10-12 hours through lower powdered scopes isn't much fun after a couple days of it. The higher magnification greatly reduces eye fatigue (and shooter fatigue)by a wide margin.
Lower power settings can be useful when dealing with mirage, but if the conditions are such that mirage is wiping out your 20X setting at 400 yards, 14X will gain you only about 50 yards more clear vision. Sometimes you just have to guess where centermass of the hula-dancing dog is actually at, and shoot through it.
Mike