Hi there, in order for you to take that shot you must be 100% confident in your shooting ability. A 6 inch spread at 40 yards to me is a bit wide. I practice out to 60 yards and consistantly hit within a 4 inch or smaller circle. But, that takes alot of shooting proctice. You must also take into consideration, time, place, conditions (weather), topography and the ability to shoot perfect everytime. Now the trick to bringing down your grouping is to be completely calm, breathe, set, anchor point set, shoot and follow through. The main reason I see people shooting poorly at long distances is they drop their bow arm or push it to one side in order to watch the arrow fly. This is bad, too many variables. Proper follow through, which means after you release your arrow, do not move until your arrow hits its mark. Good luck.