A trip to the range will tell you whether or not the rifle likes Powerbelts. Two of the pellets are more then enough and I personally would not go more. Also be sure to use a good 209 primer like a Winchester W209. I personally would not aim for the shoulder but behind the shoulder. Then at least you will get the penetration and they should do good. Keep us posted as to how the rifle shoots and your luck..

Good luck hunting.