thanks for the reply bill!
yeah i did a 'ballistic penetration test' with an apple .At about 10 yards the 2 or 3 that hit only go in about 5 or 6mm.At 3 yards 2 centimetres.
The cat came around again since.He looked straight at me.The range was about 10 yards or a little more.Even still through the scope I could see it jump about a metre off the ground so i'd assume a few pellets connected
The intention wasn't to kill it just to discourage it from coming around again.