Then I misunderstood and apologize.
Wrong on all counts. The levergun in capable hands gives up very little, if any to even a semi-auto. Mainly because the lever is operated while coming down from recoil. Which is not something that can be hurried. So the actual time between controlled, aimed shots is going to be similar. This is well proven. Besides, it's the first shot that counts.
Third-hand anecdotal information doesn't carry much weight.
I'm not down on shotguns, I've probably spent more on shotguns than 90% of the people here. I'm down on shotguns for this purpose, because it just doesn't compute. Period. At all. It seems to have this mystical quality that defies all laws of nature and physics. For whatever reason, people believe the 12ga slug can be bested by nothing short of a 20mm cannon. Fortunately for those of us in the real world, perception does not equal reality. I believed it too once and for the same reasons. Until one day I decided to think for myself and after doing some calculations and research, I changed my thinking. Because the slug is not magical. It has to abide by all the same rules. Those rules state that for deep penetration you need a toughly constructed projectile with a high sectional density. This is well-proven and beyond question over +100yrs of use in Africa. This rules out the Foster slug immediately. Because it's too soft and has a lower sectional density than roundball, if you can believe that. The Black Magic is certainly better, it's hardcast and heavier but still not heavy enough. Like I said, comparable to lighter jacketed pistol bullets. Finally, with the Dixie Terminator we're getting into range but it's still only comparable to standard weight pistol bullets. Not even in the same zip code as a 4050gr .45/70 or 355gr .444, let alone a 300gr .375, 400gr .416, .405 or .450/.400.
But they do not penetrate as well. They penetrate how we should expect them to, according to their sectional density.
What does this even mean???
This is irrelevant and neither are legal.