So the first thing I would check is: What are the rules for the type of match you are shooting? There may be some limit on weight of the rifle, type of sights, etc.
The next question is: benchrest, prone, 3 or 4 position? High-magnification scopes are great for benchrest shooting, but you would have a hard time using one off-hand due to the shake.
Most smallbore matches are 50' - 100 yards, so parallex correction might be important if shooting any close-range targets.
As for MIL dot and other reticles, I don't think they are used much outside of tactical rifles and service rifle style matches. When I shot smallbore, I would have a notebook with the number of clicks from a 50' or 50 yard zero that needed to be done to move the point of impact up for 100 yard stages. On some matches, we were allowed to shoot 5 foulers to warm up the barrel and a few sighters to verify zero with a target that didn't count.
So my first pick would be a scope with turrets, parallex adjustment, and a plain reticle. If you only ever shoot from a solid rest, 10X or higher magnification would be fine. If you shoot all positions, I'd want something that could go down to 4X. If you shoot at dawn or dusk, a very high-magnification scope may start to feel dark, unless it has a very large objective.
Arclight