Magazine capacity has always been a problem area for me. Where do you draw the line? If we went strictly by statistics we wouldn't bother with a gun at all because the stats are strong evidence that we will probably never need one. Yet we decide that regardless of the odds the consequences of not being adequately prepared are too horrific to risk. So now we are at "adequately prepared". My choice is to go with the two-shot average that you mentioned and then at least double it, just in case, because of the horrific consequences factor. We can spit out what-if scenarios until the cows come home and come up with situations where no gun is enough to save us. We all have to pick a compromise point somewhere between a single-shot H&R Topper and a belt fed semi auto shotgun on wheels - and then we have to live (hopefully) with our choice.