Well then, he was wrong about the penetration. This was very common in "the day", to throw words out in the sporting press, thousands at a time, just for recreation. Hey, that's kind of like internet gun forums, huh? Seriously, #10 didn't have any penetration then and it doesn't have any now. Why would I want to eat a grouse with 77 pellets in it when I could eat one with 6 pellets in it? Pellets on game birds smaller than 7 1/2 is insane, inhumane, and hard on your teeth.