When I was looking for a new turkey "smoker" last year , I was leaning toward the 870 for its reputation, and because I already owned a Rem-choke Undertaker .665 and hoped to find a suitable load for that combo.
I searched the "Pattern Pics" section of this forum, and liked what I was seeing from Heavy 13-3"-#7's.
I bought the 870 Express 21". Light to carry and easy to handle in the woods.
I polished the barrel per info I found here as well.
After patterning the rig I was confident to 50 yds.
I took two birds last season, at 38 and 44 long steps. I am very happy with my choice.