Around 1980 there were a group of Mexican-American U.S. Border Patrol agents shot bowling pins at Richard Davis's Second Chance match in Michigan. These were tall, beefy fellows and they each shot, as I recall, a Smith & Wesson .45 Colt with 4" barrel. Blue, of course. These guys shot like greased lightening and reloaded with speed loaders smooth as cream. One of 'em said they practiced speed loading in their off time, and always while watching television, dribbling dummy rounds and speed loaders on the floor.
Recall their ammunition as factory, the Peacemaker's traditional Round Nose Flat Point.
David Bradshaw