No, they’re proprietary. The gun comes with an adapter (chamber insert) that lets you shoot pellets. It does pretty well for a smooth bore.
Having seen the size of #7.5 shot I cant imagine that the #9 would do much good past about 10 yards or so.
I will stick to my trusty Beeman and my old Crosmann 766 for tree rat and gutter eagle control:-)
I have gotten tree rats at about 100’ with the Beeman and .22HP pellets
Regards
alfa6 ;>}