You have more than enough pellets in the kill zone. I shoot a 20 gage pump with an Undertaker choke, even using cheap old Federal 2.75" #7.5 field loadsit will shear a turkey's head off at that range. At 40 yards it still puts more than enough pellets in the kill zone to do the job twice. Know your range, your ammo, and what your equipment is capable of and you'll do just fine.