To answer your question directly, I use my maximum magnification (24 and 25 power) for shooting paper. Most of my homemade tuning targets feature a tiny (1/8") aim-point that I need to see at 40 yards.
And now for a bit of rambling on with my thoughts on scopes...
For my plinkers and "short range" (sub 50 yard) hunting airguns I prefer modesty priced 3-12 or 4-16 power 44-50 mm objective scopes with simple moderate weight reticles. I'll sight in at the highest magnification then set to minimum for use. I find the glass on these scopes to be fine for this use.
Most of my "longer range" pesting/target PCPs wear mid priced Element Helix 6-24x50 and I'm very happy with them. A nice scope for general use, the turrets have positive detents and operate smoothly.
I have an Element Titan 5-25x56 FFP on my Panthera. While I like the scope itself, I find that the reticle is good at high power, it's too fine at low power. I now know that I prefer second focal plane scopes, the Titan will be my only FFP.
I tend to prefer a simple, uncluttered reticle of a thickness to is easy to see against a normal background of limbs and bush. Maybe not ideal for long range paper shooting but I'll accept that compromise.
As a gripe, I'm less than pleased with the mushy turrets on my Hawke Sidewinder and the reticle on my MTC is too fine for practical use. Buying airguns online has been a good experience, not so much with scopes. What ever scope you are considering, I strongly suggest that you actually handle and look through the scope before making a purchase.
Not so apparent when looking at the stats, the size and weight of these big objective scopes can be a surprise as well. Not a problem for a hefty bench rifle, definitely a consideration on a walkabout hunting rifle. If you are not shooting in low light (early morning, late evening) conditions, a smaller scope might be fine for you.
Just my 2 cents.
Cheers!