I was looking for a little help. I have a Lyman .50 Deerstalker and cannot get this thing to shoot any pattern. I am shooting 90 grain of fff with a 295 gr powerbelt aero tip sabot. What should I be shooting out of this gun. I am looking to try and sight in Sunday because we got drawn for the Pymatuming hunt and need to have it ready to go. Very excited about that. Thanks in advance for any help.