Re: Scope magnification
I use a 4.5x14 on my light rifle 7mm Rem Mag. I use a 3.5x15 Nightforce on my heavy rifles (338Edge and 338Allen Mag). Never had a problem or felt it was a disadvantage for shooting big-game. I'd feel confident out to 1200yds or so with it.
The only advantage I can see with higher magnification is the ability to judge horns (make sure the animal is legal) at a greater distance. I almost always carry a spotting scope 20-60x and tripod when I'm hunting long range, so it just costs me a little weight.
I use a ballistic reticle on my nightforces (NP-R1) that is only accurate for hold over at the highest magnification (15x), if I had the 22x scope, it would only be accurate at 22x. I like the greater field of view from the 15x scope (for spotting my own shots). Also, generally, the higher magnification will be more troublesome when mirage is bad.
Hope this helps,
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