Got nothing against single shots, but personally they're just not for me. Only the most self confident shot can safely use one (esp. against dangerous game). I just don't have that kind of self confidence.
When hunting, I always try to control as many of the factors as I possibly can. Because believe me ... once you're out there in the bush, there's plenty of factors out there which you CAN'T control.
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I went after my first and second man eating Royal Bengal tiger in '81 and '88, armed with a Pakistani 12 gauge (2 3/4") single barrel shotgun. On both occasions, the ejector of the shotgun failed to extract the spent Eley Alphamax L.G shell after I had given the tigers the first shot. And I had to forcibly pry the expended shell out of the breech, with a folding knife. By the time I had finally finished reloading the damn gun... both the man eaters had gotten out of my sight. At any rate, even if the shotgun's ejector worked perfectly ... I doubt that I would have been able to get another L.G shell into the breech in time before the tigers managed to get away (or even attack me, which they definitely would have if I wasn't inside a hut on the first occasion and on top of a macchan on the second occasion). Fortunately, on both occasions the first shot had eventually proved fatal. The first tiger succumbed to his gunshot wound roughly seven hours after taking the shot. The second tiger folded within roughly four hours.
Now, yes. A cheap Pakistani shotgun (worth the equivalent of 50 American cents back in those days) shouldn't be a fair representation of single shot weapons, in general. But still.
After the incident in '88, I resolved to never hunt with a single shot weapon ever again. Bolt action rifles and double barrel rifles for me, always.