I would suggest the M1A, and in particular the Scout model for your intended use. I find them to be better balanced than the other 308 class rifles, and plenty of precision for the types of shooting distances your describing.
Other things I like about the design.
1. The location of the safety as well as the op-rod handle.
2. The iron sights are well made, reliable, and repeatable once zeroed.
3. A multitude of high quality parts are being produced for this design at present, to include current production CMI magazines.
4. Overall reliability, easy to maintain once you learn how, and if properly maintained....will be around for your next generation to enjoy.
5. Optics mounting, stock choices, and other mods are plentiful, and give the M1A user plenty options to taylor make the rifle into whatever they like.
6. It can be used with either hand, and is quite lefty friendly. This is a nice feature for right handed folks who enjoy "switch hitting", so to speak.
In short..... a rifleman's rifle.
7. It shares a few common parts with the M1 Garand.
8. SAI lifetime warranty that travels with the rifle, new or used.
9. History is deep, and still ongoing, as my issued rifle time now is an M14. ( It sports a Win receiver, and no.....I can't keep it after I get back home.)
10. The chicks dig um.
11. If you run outa ammo during a zombie culling mission, it makes for the better club.
12. The only thing better than an M14 type is having 2 of them...
Cons: See #12 above as it concerns your wallet. They are addictive imo. I couldn't stop at 2, let alone one. ( Most of my kids have one as well, to include the wife.) Your other rifles will be jealous as they wont get as much attention as they were used too.
M14sRock is another victim from the looks of one of his pictures of his floor. Hard to see the floor on account of all the M14 types lying on it. ( I would hate to have to go to the latrine in the middle of the night as I would most likely trip over one while lookin for the light switch.) The good news is that it wouldn't bother the rifle, only my feet.
Note: Then again, I might just be suffering from separation anxiety.