wow, some great info here. Thanks everyone. I had pretty much decided on a 40mm, but wanted to see the argument for the two, and the info here settled mythoughts and debatesI have had with our hunting buddy.I have 50mm on my .260 and my Encore 50cal of all things...simply b/c one was free and the other was a gift from my father, who was went with the 50mm due to a couple people giving the "it gathers more light" argument. I have been eye-balling the Leupold VX-III in 3.5-10 X 40, and I think that is what im going with....and going to see if the guy will cut me a deal on 2 leupolds so I can replace the 3-9X50 Tasco that sits atop my .260.