Just an observation, but the 284's 55mm case length makes for a tight fit with the long, high BC, bullets that everybody wants to use when shooting at long ranges. Heck, even the 260's 51mm case length is a tight fit in a short action with those longer bullets, otherwise there wouldn't be a niche for the shorter 6.5 Creedmoor.
I have a Savage 11 with a heavy Shilen barrel in 260 that is a 600 range bell ringer. When the throat gets worn, I'm much more likely to set it back far enough to get a fresh throat and cut a 6.5 Creedmoor chamber than I am to set it back less and rechamber to 6.5-284. This is a magazine fed rifle, but I threat it as a single shot, as the throat is too long for the magazine length.
