First, 40 yards is a long shot. A lot can happen with even the fastest bows at that distance. I have been hunting all my life and bow only for the last 20 years and I can drill a 3D deer target at 60+ plus yards every time BUT it dosen't step, turn, flench, or jump the string. I keep my shots under 30 yards and it has to be perfect before I will shoot from 20 or more.

As for draw weight, my son shot his first deer several years ago at 9 years old with a 35# bow. He did not get a pass thrugh but the fletches were all that stayed in the exit hole. This kid could drive tacks at 10-15 yards and his bow shot like a dart. He used 100 grain Muzzys and Gold Tip arrows. With the correct set up and a WELL tuned bow 35-40 pounds should be O.K. out to 20 yards but that is about all you can get out of a short draw, low weight bow.

Shane