My oldest son killed a nice doe in October of "07", using a 410 grain arrow coming from 39lbs @ 26 inches.
The shot was from a treestand, and his Tusker Concorde two edge went in between ribs, got both lungs, and chopped through a rib on the way out.
His arrow buried to the fletching. Great bloodtrial, and a short, fifty yard recovery.
The bow was a recurve made by Darton Archery back in the late seventies. When this bow is shot next
to some other bows, it`s performance lacking.
My son turns thirteen today, and last weekend he
took money out of his savings and bought himself
a Predator recurve that draws 42@28. If the old Darton could do it, then this bow will certainly have no problems. Performance between the two cannot be compared.
I was very worried about allowing the use of such low draw weight for hunting. I followed all the common suggestions you will see here, and built an arrow that carried around ten grains per pound of draw weight, made sure his arrows flew straight and clean, used SHARP two edge heads, and kept his shots close.(under fifteen yards)
My fears were unfounded.
It`s all about getting close, and being able to put a sharp broadhead from a clean flying arrow into the lungs of your quarry. When your target is deer, forty pounds is lots.
Hope this helps.