Hornady 86224 Heavy Magnum Coyote 12 Gauge 3" 1oz 00 Buck Shot 1300 fps

Bought a new tactical 12 gauge shotgun and the requirements for the action & ejection takes 3" magnum shells. Originally i tried 2 3/4" reg bird shot and while it shot the shell, it would not eject the 2 3/4 shell at all! Not enough powder to get the job done. I haven't been to the range yet but i'm confident in Hornady ammo having used their 223 & 5.56 in my AR-15s.