I killed two doves with one shot with Fiocchi Interceptors and my HE Fox, two seasons ago. Both were dishrag dead before hitting the ground. They were at about 25 yards, crossing, when shot. The maximum distance at which spreaders are useful depends on several factors, IMO, one of which is how much choke constriction the barrel has to begin with.

I'm a huge fan of the Fiocchis for close rabbit targets and really close crossers on a sporting clays course.

May God bless America and those who defend her.