Ron V, consider the adrenaline effect during either a confrontation or during a hunt. Pumps work best when racked strongly, some will not feed correctly if baby stroked.
BTW, one training 870 I've used was on the firing line from 1981 to 1998 and still might be there. This weapon fired thousands of rounds yearly,and most of the time it was racked hard. As I recall, the total repairs was a new mag spring and wood. Yes, it did look rough, but it worked....