Depends on what ammo and how accurate the gun is. It doesn't really matter how much energy it has at 200 yards if the groups are foot wide. Most manufacturers list energy levels at different distances. If you have a specific one I can run it and see where the energy starts to really drop.

I know for a fact the newer ones will go at least 500 yards and still have enough energy to do damage if you miss. So you need to be weary of what is behind your target when you are hunting.

Paul