Too small in diameter (for me) - why shoot a .45 or .50 cal. bullet from a 12 bore, when you can shoot a .73"?
penetration

understand the problem with soft lead slugs on grizzly is penetration and the sauvestre will not fail in this question. if you like the big diameter the duplex steel monolit would be the right thing http://www.ddupleks-usa.com/products but its only available in 12 ga.