My BSA FAC Hornet has an old style Nikko Sterling 6-24 x 44 scope I bought off here about 12 years ago, I tend to use it at either x6, x10 or x24 depending on the situation. x10 is good all round but as has been said if you need to get in close with something that’s hiding in the trees then 24mag sometimes allows a shot where the lower mags wouldn’t.
One thing I have found is that going up in mag often means you don’t see twigs etc at closer distances between you and the target which sometimes means you miss completely.
I also have a ChairGun derived cheat sheet which gives me hold over/under at those three mags
Norm