I hate poachers...but don't put yourself in a bad position. Call 911, get all the info you can, description,tag numbers and take pictures if you can.
You really do not want to confront people breaking the law that are armed. Also, keep your cool because you can and will be liable for actions as well.
I had a scum poacher take this what was a close to 200" dear on my ground and unfortunately was unable to catch them.
Be safe and careful.