Don't want to start any caliber war or a 'what about this or that' thread. My young kid is 10 years old, a great shot and a keen (and adept) outdoorsman. He goes on every hunt with me, traps and has a few successful hunts of his own (big and small game). His 2 favorite guns for general carry are his 20Ga 870 Magnum Express (shortened stock, 18.5 bbl) and his Marlin 1894 lever in 357M. He is very familiar and quick with both guns.
Also to add, we have had a couple of bear 'huffs' close by and one bluff charge, my kid has stood his ground on my shoulder ready to back me up should I have needed to shoot at a bear in defense, so I trust and rely that he would be putting rounds down. Knowing how calm he is and how well he shoots I actually trust him to get rounds on target more effectively than me
So the question is, what do you think would be a more effective round out of the 2; a 20Ga 1oz (437.5 grains) Brenneke Slug at 1450FPS MV (Brenneke numbers) or a 200Gr 357 LFN at approx 1800FPS (need to chrono, that is a reloading book number)?
The numbers put the 20Ga at 2042Ft Lbs ME, SD 0.165 lb/in sq and the 357 at 1439 Ft Lbs ME, SD 0.223 lb/in sq