Re: Bump and run* PW for pitch and run shots - fly it in and let it run (more lofted wedges tend to check up too fast)
* 8-iron for close-in chip and run shots.
* 7 or a 6 iron for longer B&R shots 40 to 80 yards. For these shots, I generally toe in the club for running shot, and aim to drop ball on the edge of the green to deaden shot some for upfront pin positions. (Unless of course cup is on the back of the green, then I aim for center.)
Go with smooth takeaway, and decent followthrough without killing it. (Too much smash can cause ball to balloon)
Longer B&R shots useful into the wind, or for defeating false fronts which would spin a wedge back off the green. And, if the pin is tucked into a narrow lobe of the green, it's often safer to drop a running shot into the wider part of the green and let the shot release toward the pin. Also useful in hot weather when a high wedge shot can bounce off edge of narrow, banked green.
I never learned how to use a wedge properly until I was 21 years old; so, I have played with bump and run more than some.