Really,..? I've known Mr. Marshall for going on 38 years. Honest to a fault, been there and done that. He has probable forgotten more about ballistics and shootings than most folks recall.
147 grain rounds are fine when properly placed just like any other projectiles. I've seen a great deal of folks downed and out with 9mm ball or less. Personally, I never much cared for them but NOW, with 3rd or 4th generation projectiles, I load my BHP with them as I prefer to use standard velocity rounds in it. We must still endeavor to place as many projectiles into a threat as possible as fast as possible or until that threat ceases to be one. Carry what you like and your weapon likes as it really doesn't matter what I or any other party likes or doesn't. It's your Tookas on the line.