I believe the quality of the scope is as important as the power.
I also believe a 3-9 x42 is sufficient in any situation. Most hunting scopes
max out at 9 because you can still hold it steady without
a rest. Buy the best you can afford. my dream scope is the
KAHLES 1" AH3-9x42. The clearity and brightness in a high end scope
will surpass that of a low end with a 50mm objective.
Cheers