All this talk re "bore guns", I think eveyone should look back in history to the era of hunting with BP Big Bores - 4, 8, 10 and 12 and have a read of what the old hunters said.
You may notice that not many thought a 12 gauge bore gun was up to it, hence the prevalene of 10 and 8 bores.
We seem to forget the past too readily and try to reinvent the wheel 10 times over every year.