There isn't any penetration issue when shooting "low poundage" 55 lb. bows. Particularly on deer. Vickie from "The Choice" shot through a moose with a 57 lb. bow. The velocity difference between a 55 lb. and 65 lb. bow, shooting the same arrow weight,is maybe 20 fps. So the pass through with the 55 lb. bow comes out the other side of the deer at 60 fps. - instead of 80 fps on the 65 lb. bow. Inconsequential.