6X is a .22LR plinker scope, close quarters varmint scope or a 100-200 stand hunter's deer scope.
10" targets are about 3 MOA at 300 yards. 6X will get you by. If I was shooting a deer at 300 yards and had the option, a solid rest and the time to increase my power setting from 6X to 20X, I would instantly. It will increase my ability to precisely place the shot.
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A 3" dot at 100 yards is about 3 MOA and 6X will do if that's all ya got.
I think it's a matter of what a shooter is used to as well. I practice a bunch at 300 yards with 6x scopes on targets a lot smaller than deer vitals. A 3 MOA target looks huge to me.
