I agree with GMMAT. A group the size of a pie plate will kill everytime as long as the shot angle is proper. A hard quarter shot may not get the job done with that kind of group but your a newbie and should know when to shoot and when not to shoot based on your skill level and shot angles and when to take a shot is always factored in when taking the actual shot at an animal no matter what skill level. Saying that if you cant shoot a 2 inch group at 20 yards every time then you shouldn't be in the woods hunting is garbage. A deers heart is a little smaller than a pie plate and that doesnt even include the lungs which are much larger (which a double lung shot is just as good and an easier target than a heart). I personally aim at the top of where I think the heart is so I'm basically aiming for a double lung maybe catch top of the heart and if my shot is a bit low then I get heart and if the deer ducks a little or my shot is a lil high I'm getting a high double lung. Aiming just at the heart reduces your chance if you mess up a lil and shoot low. Some will disagree and say they always aim heart which is fine I just like to try and reduce the chance of error on things I can't control like the deer or just a miss judged distance, ect.. Just practice those 20 and 30 yard shots until you are confortable you can kill the animal every time. Once you get those down keep backing up or like said practice 40 yarders and those 20s will be that much easier. When I practice long range shots out to 80 yards gettin ready for an elk trip I'm confident I can kill every time if every one of my arrows is within a group the size of a regular paper plate (much bigger vitals on elk than deer). Same with the deer and a pie plate out to 65 yards for me. Although I never use plates for my target. Always use something small like a white dot, maybe 2 or 3 inches or smaller the better you get, in diameter for practice unless your practicing your 3D/2D animal targets. Aim small, miss small. I'm sure youll be fine as long as you practice and find your lethal limits with your shooting. Good luck. WCL