Shooting paper I always shoot at maximum power on the scope (9x, 12x, or 14x depending on what rifle I'm shooting). Hunting or shooting at a moving target is a different story and I adjust the power down to increase my sight picture accordingly. When trudging through the woods deer hunting I use the lowest power setting I have.
I shoot a 5-25 and I find that I usually shoot at about 10X or so for 100 and usually sit around 15X or so for 200 to 300 or so and then start eeking into the higher range for shots beyond that.
If anything is moving (I'm not all that good at these) but then I'll head down to about 7.5X. Any magnification lower than that doesn't increase the Field of View cause its FFP so I usually stick around there. Sometimes seeing things smaller by a bit helps and I'll dip down into the last 2.5X but thats not really all that often...
I find that I shoot tighter groups at lower mags on paper. Aim small / miss small.
5-6x. I shoot worse, not better, with higher magnification at that range. I think its a holdover from all my M1 shooting--I like having a broader sight picture for aim, rather than aiming at some small detail on the target. I'm not sure that is a good way of describing it, but that's the best I can come up with.
Depends what I'm doing at 100 yards. If shooting small targets or groups probably around 15x but if i'm shooting something from an unstable platform like barricade drills or positional it will go down to 10x.
I have a fixed 6 power on my 100 yard target rifle. I only use this for 100 and nothing longer. I find even that can be a bit too much if shooting in the standing or sitting position, probably a 4 would be better.
I have a Leupold LR/T 8.5x25x50
For 100~200 yards, I set it on the lowest (8.5x) and feel very comfortatble and no mirage at all. Plus, I dont have to deal with the crosshair movement everytime my heart beats.
For 250~300, I set it on 10x or 12x.
For 350~400, I set it on 15x
I dial it up to 25x only when I need to see holes.
I m still practicing and learning how to shoot long range.