I'm not high tec, just a guy that has killed a lot of yotes. I used a Rem 3" 1100 with a full choke with Federal 3" Copper plated BB's or factory 3 " #4 Buck.

We hunted Mexico prior to 1989, killed hell out of all predators, no one would believe the numbers.

Federal makes a box of 25 of their copper plated Buffered BB's, just make it your mission in life to get a case of 10 boxes.