If you're strictly going to shoot at targets at known distances, your requirements will be easier to fulfill than if your shooting at variable and/or unknown distances. On my .308s used for hunting, I use 3-9x40 Zeiss Conquest scopes with RapidZ600 reticles. On the one .308 I use strictly for targets, I have had a 3-9x40 Zeiss Conquest with a Z-plex reticle. On one of my .30-06s that I take in anticipation of long-range shooting and my .25-06 used for long-range varminting and speedgoats, I use ZC 3.5-10x44 scopes with Rapid Z800 reticles. (I used to have an old Redfield 2-7x on it but I treated my self to new glass on that scope's 35th birthday...that li'l Red was the best $78 I ever spent on shooting). I also have a nice Ruger M77 International in .308 that is very light and compact; I have a Leupy 2.5-8x34 on it as I don't expect any shot longer than 300-400 yds. Except for the range, I keep my scopes set on minimum magnification to maximize field of view and only run it up as necessary for the shot.
In my experience, many shooters get more scope than they need for the purpose they intend to achieve. My target Rem 700 SPS-Varmint is a fairly consistent 0.5 MOA rifle out to 200 yards, bedded in a B&C Medalist A5 stock. As I'm going to see what I can do between 600 and 1,000 yards, I'm going to switch to a 3.5-15x50 or a bit bigger. I'm sure I'll not shoot any better but I'll have one less excuse for my misses.
FH