I have a 3D course in my back yard behind my shop.We shoot from the ground and from a 4`x4` platform w/rails for safety from the 16` high roof.Last year my son and I just for fun rig up a delta target buck on a rope & pully system.We tied another long rope around is neck and pully 45% angle away from the target and the shooter.I was amazed at how hard it was to hit.But with just the right lead we were both hitting the 10 ring.I have a muzzy hunting video that shows a hunter shooting a running buck and makes a perfect shot. I would never try that unless it was a monster buck that i could not stop.It would be hard not to.any way It was worth all the trouble when i saw that smile on my sons face.