Higher than 6x is a pain on fast moving targets from unsupported position.
After 60 plus years of hunting all over Canada, this is a good observation. Field of view is a lot more important than magnification. I have shot a lot of big game animals, and 85% of them have been at less than 200 yards, well within the capability of a 4 or 6 power scope. In fact, a good fixed 4 power will do for hunting in the East or in lightly wooded areas, and a good fixed 6 power works well on the Prairies. A fixed power scope tends to be more trouble free than a variable power one.
That said, the best feature of a 2-7 or 3-9 power scope is the ability to turn the magnification DOWN in hunting conditions, especially in the Cedar Swamps of the East or the dark timber of the mountains, where many shots happen fast and close.
However, if your intent is not hunting, but to punch holes in paper targets, or trying to hit small informal targets at various ranges, a larger magnification can be useful. What people tend to forget is that more magnification does not bring the target closer and you still need a good knowledge of ballistics, weather, wind, light, mirage and several other factors to make those really long shots and hit the object you aim at.
To take full advantage of the scope, you also should have an accurate rifle to begin with. A lot of people simply slap a scope on a rifle and expect a miraculous improvement. The scope is only one component of a system, the others being an accurate rifle and a SOLID mounting of that scope. And, don't forget the ammunition. Rifles are like fingerprints - alike yet different. They tend to like a certain type and weight of ammunition, and a bit of experimentation and range use with different loadings from different manufacturers can see an immense improvement in accuracy. Reloading is even better in most cases, but today's ammunition is a vast improvement over stuff that was made years or decades ago.
Price is a factor. Mounting a $1000 scope on a $150 milsurp is a bit of an overkill. Over the years, scope manufacturers have improved their lower priced lines, and today even most of the low priced budget scopes achieve a level of optics that we only dreamed about 50 years ago.
Good luck, and tailor whatever you decide upon to your own individual needs right now.