My first hunting scope was a K 2.5 and it was mounted on my first centerfire rifle, a customized Savage 110 that I used for varmint hunting and deer hunting. I shot lots of woodchucks with it, using handloaded 125 grain Sierra varmint bullets. My fartherst kill was a woodchuck at 450 yards, on the (second shot).
The Weaver scope was pretty nice and I don't remember much about optical quality, but it seemed fine to my late-teen eyes (wearing glasses).
I once read an article that tested the accuracy of pointing of various scopes, open iron sights, and receiver sights mounted on the same board, all set on a variable tripod and verified by a very high-powered target scope.
Result of the test showed a large difference in pointing accuracy between open irons and receiver sights, then a huge difference between the irons and a 2x scope. However, there was very little pointing error among the scopes.
Recognizing the value of scopes on a rifle, I've always hunting with them. After the 2.5x Weaver, about all my sporter scopes have been variables in the 3x-9x range.
If I could only have a single-powered scope, it would probably be a 4X, which was quite popular when variables weren't either available or affordable.
The highest power on all my scopes is used for sighting-in and spotting antlers, etc., but for walking around, at the lowest settings. On stand, I set them at about 6x, which allows adequate identification and reasonably quick shots. When time is available, power is turned up to spot antlers, etc. especially at the longest ranges (300 yards and up).
When walking around, scopes are set at their lowest power, for maximum field of view. I don't often walk around in deep woods with a scoped rifle, unless there are opportunities to take a stand in a fairly open area of mature trees.