Nah. No such thing as a must have chambering - except .22lr.
.308 is a very mediocre cartridge choice for long ranges - inertia is what keeps it popular (and military use, which is what started the inertia). .260 rem and other 6.5 outperform it at long range with less recoil, which plenty of oomph to take out personnel or large game.
Not a .308 fan here. .30-'06, yes. But in a short action, .260 rem or 7mm-08 are both superior in my view, provided you handload. And importantly, you can get many "MBRs" (if you want to use that phrase) in .260 rem now (AR10s, FALs, etc.) .308 is quite passe, in my view.