If you are really interested in low light performance, I'd get a larger scope. Like the 2-7X33 models. Even a VX1.
A 33mm scope would transmit about 67% more light. That would allow you to use over 6X during twilight. The best you can do with a 20mm scope is 4X. E
A looooong turkey shot is 60 yards; the vast majority are shot at 40 yards or closer. I don't think magnification will be an issue. In fact, they'll probably have the scopes on the lowest end anyway - 1.5X. Why not a simple red-dot then? My wife can't see well enough through the best red-dots. The VX3 glass is much better than the best red-dot glass available.
