Your problem is 2 fold #9 shot and a 3” barrel bond arms gun. No barrel length = no velocity and “9 is very small shot and will not retain what little energy you are getting through that short barrel. An H&R single shot full choke with some #6 or #4 would have easily done the trick.
Yup Yup and Yup
3” derringer LOL #9 shot LOL prolly a 2.5” shell LOL