1. How is a .22 different from a 22mag? (Bigger in what way?) On the same subject, what about 17 compared to a 22? 2. I'm rooting through some catalogs I ordered and I'm noticing the shotguns (at least in the Winchester catalog) are jumping in price from 300ish to 900-2000. Why the huge gap? What makes the expensive ones better? 3. What's the benefit of a single shot rifle (if there is one)?