I don't like to give advice. I much prefer to show examples of what I have done or what I have learned.
I've had no problem hitting prairie dogs to 300 yards with 7X. I've had no problem hitting a deer's neck at 25 yards with 2X and 3X--or in making a chest shot on a buck at 350 yards with 3X.
I've poked my .22 out the window and shot squirrels at 10 yards with 4X.
I have a Weaver K4 on my AR. I figure that if I can see the target, I can hit the target. So far, so good, for many and many a year.
IOW, I think folks worry too much over non-essential details.