I've done some "precision shooting" in the Army and for our PD SWAT.
Some advice, the majority of your 'precision shots' will be under 120 yards, and likely under 70 yards. Do not waste your time, or money , for a mil-dot reticle for these close range shots. Instead, budget a high quality, durable range finder with 'rain mode'. It will more accurate and much quicker than computing your shot with the mil-dot rangefinding system.
Mil-dot rangefinding systems are generally for longer distance on a known-size target. In the majority of tactical situations you are only going to have a partial view of the suspect, and therefore would have to use the doorway, usually 6'-8" for residential and 7' for commercial as your known-size target for range estimating.
You are on track with the scope power beginning at 2.5. You won't need a scope that starts at a higher power for such short ranges.