If you ever try shooting from a bench with a 30 round mag you will know the answer. Not to mention that for deer hunting, 10 rounds is more than enough. If I expected to get into a sounder of hogs I might use a larger mag but even then, 10 should be plenty.
As far as being sold out everywhere, at least with pistol mags it is likely due to the fact that they could not find the larger mags so then they went on to the smaller capacity mags till they were sold out too.
As far as being sold out everywhere, at least with pistol mags it is likely due to the fact that they could not find the larger mags so then they went on to the smaller capacity mags till they were sold out too.

