My ATV has a double-scabbard rig strapped up under the roof.
Every time it goes out more than five miles from home, it carries a Marlin Guide loaded with heavy Garrett loads in one side, and a 14-inch Remington 870 with 00 Buck in the other.
Those are my "Everytime" artillery, carried for short-range defense.
Between the two, they'll handle any bear in the lower 48, ****ed-off moose, cougar, wolves, rabid coyotes, and anything else with four legs that might take after me.
I've considered taking along the SKS, may someday, but on non-hunting trips where the only critter-shooting would be defensive, the only real advantage in it for me would be in a surprise pot-farm discovery. Which does occasionally happen out here.
Otherwise, a third long gun is either a .22 for plinking, or a Weatherby .223 just acquired for coyoting.
This "third gun" can change, depending on what other activities a given outing might involve.
I have no "One Gun Does It All".
Everybody considering a rifle acquisition should sit down, figure out exactly what he or she wants that rifle to do, and then choose a gun/caliber/bullet combo that meets the projected role of the gun.
Buying & trading, and THEN asking for advice, isn't the best way to go about it.
You want a general hunting rifle, figure out what & where it'll be hunting & go from there.
You want a varmint rifle, figure out what sort of varmint it'll be going up against & go on from there.
You want a "survival" rifle, figure out what it'll help you survive (starvation, attack by large animals, attack by humans) and go on from there.
You want a bear gun, get a REALISTIC bear gun (based on the type, locale & size of the bears it'll be used on) and go on from there.
Don't use a .223 varminter on a grizzly, don't use an elephant gun on squirrels, and so on.
The 7 Mag boltgun & the SKS are two vastly different guns.
Figure out what you want your rifle to do, and then get that rifle.
You want power & range, 7 Mag.
You want rapid fire, medium range, medium power, SKS.
Denis