"Speed kills", a lesson learned by many a snow goose hunter and pass shooter the hard way after lead was banned & the early steel shot wasn't very exciting & was too oft undersized for the intended purpose. More recently, you see where some entities are advocating quite high velocities w/light loads on dove(!)and that's using smallish lead shot. I don't find that necessary, being an advocate of larger shot for putting birds in the bag w/minimal damage, admittedly not the most popular view.
It also happens that particular Kent ammunition has a good reputation because it works well on the intended game. Hard to knock success.
Personally, looking at down range ballistics of spheres, I find it makes more sense to take shots within a known killing range at MV's of around 1200fps w/a shot size adequate to insure breaking the bird down when hit. That requires restraint and not taking many shots that others would. Few of us are exacting judges of distance, myself included.
