Re: What\'s the minimum power for comfort to 500-600 yrds for varmint
If it was me and I was trying to kill rabbits to eat at 600 yards, which means trying to hit them in the head or front quarters at least, and if I wanted to shoot the head off a grouse at 10 yards, all with the same scope and gun; I would go with something on the order of 4-16 variable with a good focus system and a fine crosshair.
The scope and gun I am referencing are old and single power glass is just the way it was done 30 years ago. I can get by with it and am used to it but another person would probably find it hard to use. Admittedly that gun hasn't killed any rabbits at 600 yards (about 400 yards is its best) but the optically power and quality of the scope is good enough.
I don't think you have to see their eyes, but you do have to resolve their head. I was watching Mama Groundhog yesterday at 700 yards and it is really more about clarity than power.
The Smokin Fur Rifle Club