I think you could kill a turkey or at least knock one out until you could ring it's neck if you hit it in the head. I had a Victor sling shot when I was a kid and I think I could have killed one back then. I shot marbles in it and was deadly on birds and squirrels. I killed a ton of song birds at 15-20 yds. The sling shot had 1/2" or so wide surgical rubber bands and would launch a marble at warp speed