If you want to take 1.5 seconds per shot, with a bolt action, vs 6 shots in the same time, same hits, as the AR-15, you are welcome to your ignorance. Shtf will sort you out, quickly enough.

If you want your 308 rifle and 200 rds, in mags, to weigh 25 lbs, along with the 35 lbs of other gear you need to last just a week, on your own, you are welcome to it, too. A 6 lb shorty AR, 6 spare 223mags, and 210 rds of 223 weigh a total of 13 lbs.
Me, for shtf, I'd a lot rather have a short AR, a 3/4 lb .22lr conversion unit, a spare 30 rd mag for same, and 1 lb of 22lr ammo (135 rds) and just 2 spare 223 mags and 90 rds, along with a 1 lb scope and mount, and 1 lb of sound suppressor. same 13 lbs, but a lot more capability. See thru mounts let you use either the iron sights or the scope. Return to zero scope base lets you remove and replace the scope without loss of zero. Same thing holds with SureFire's "snap on/off" flashhider and suppressors. An 11" barrel and 7" of "can" make for a still handy rifle, and don't kid yourself that it can't reliably hit you at 400 yds,if it's fitted out with a scope, bipod, match bthp's, trigger job, and free float tube.
Add 1 lb of pocket 9mm Diamondback, spare mag and ammo, and you have plenty of guns/ammo for the bugout.