I use the mid-range PM in my 870, just use normal shells and like the hevi-steel #2. I hated more open chokes because couldn't quit get the sight picture down like the PM forced me to. Last weeks hunt, 3 stone dead ducks on 2 shots after jumping them out of the deeks.
When I 1st tried the PM at the range was turning some clays to powder and was afraid turning meat into jelly but that didn't happen, instead getting more lethal hits in front of the wings to the head. Also like the ports which takes the jump out of the gun to the cheek. My dad who hunted birds for decades and instructed hunters ed in two states he lived in for a combo of 20+ years says it can't be explained why ports reduce barrel jump.