firstcoueswas80--
Congrats on drawing a tag, thats a big deal in AZ!!
Here in KY we get to hunt em all spring and in the fall and I've shot em with 12 and 20ga and normally kill 3 a year or so.
In your case, with a tag you've waited to draw for so long... spend the money on the high quality stuff. You want pattern density and energy. I would recommend 3.5" shells if your 870 will take em.
#1 Choice- Federal Heavyweight #6s in 3 or 3.5"
#2 Choice- Hevi-13 #6s in 3 or 3.5"
Make sure you got 2 oz of shot and that your pattern is tight at 40 and 50yds.
