Hi, I use an H.S.Strut undertaker (can buy most anywhere for around $25.00 and Remington Premier Magnum #4's (3 in mag) This is what shot best in my gun. Buy a tube and then try different loads. Each gun will pattern different. This combo for me puts 15 pellets in the kill zone at 45yds. But cant hit the broad side of a barn with #6 shot!! It throws it all over the place...
Try some rounds and get a sore shoulder while having fun!
Good luck
Rick