I use an undertaker heavi-shot choke tube on my 870 express mag. What kind of choke do you use and what kind of pattern are you getting at 30 yrds? this is a 30 yrd target one shot of 6's

I use an undertaker with Hevi Shot #5 with my Win. 1300. On average from 30 yards I get about 15 beads in the kill zone. Remember though, it only takes one.