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I'll probabaly top out at 600 yards. The vast majority of shots around the 300 to 400 mark. I was going to buy a Diavari 3x12x56 and then was thinking that I may need more
power.
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The better the glass quality, the less magnification is really needed. Quite a matter of taste... I was shooting an A4 size target the other day at 500 meters using 5x magnification on a Karl Kaps Sniper 2.5-10 x 56. Ok hits, no problems at all. We have a crazy heat wave going on up here and more magnification was quite useless, hot air disturbing the picture.
With that Kaps at 10x I can see 30 cal bullet holes from 400 meters in a brown IPSC target, I´d say 10x is enough for up to 1000 meters/miles or so for deer size targets. Fine reticle of course.
In my case, less has turned into more. I like to see what is happening around the target area,too. And I have used much more magnification earlier... now my shooting is much better.
Also, it´s nice to have that 2.5 , ready for an occasional "surprise deer" up close. But these all are highly personal opinions and depend on what you are possibly encountering in the woods.
There was a brown bear a few miles from my home last week. I sure wouldn´t like to face one at 50 yards with a 6 x scope.