Quoted:
SHTF and I can only grab one rifle? I'm grabbing the scoped M1A. Hell, I ain't no hero! I'll take the bad guys out from a distance and run (if I can).
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If the bad guys are far enough away that you need the scoped rifle to hit them, they are far enough away that they probably cannot see you. So, do you really need to start shooting at them and drawing their attention? What happens when they start shooting back and maneuvering their superior numbers around to flank your position? Unless you have a spare quad of guys around to back you up, you are in some serious trouble now. Whereas, if you had let them go along their way (presuming they are not moving directly toward your home already) you might continue to live on in stealth, un-noticed by the bad guys and with a much higher chance of surviving the day.
YMMV of course. I live in the northeast where any range long enough to require a scope to hit the target usually has ample opportunities for cover and concealment (lots of trees, bushes, hills and other visual obstructions to make it real difficult to pick someone out over say 300 yards. Conditions will vary dramatically in other parts of the country with much more open ground.
My SHTF scenarios also do not include trying to make it on my own out in the wilderness. They revolve around forting up with as many other survivors in the local area as possible and trying to re-establish order, not playing the lone wolf out in the woods.
Based on my fixed base scenarios, I will have an AR for patrolling and close in defense, a scoped M1A for long range defense and some large game hunting, an M1 Garand for long range or hard target defense. Then for small game hunting, I'll use a .22 LR with a low powered scope. A handgun for walking around twon/village/fort and last ditch back up, and shotgun for other close in work.
When you operate out of a fixed base you can afford to have your cake and eat it too.