I would say it is (was) a combination of many of these factors.
- The new "norm" being spraying hundreds of rounds down range from some goofy .22 made to look like an AR.
- Obama-generated fears causing people to stock up.
- Tons of new shooters joining the sport.
- Tons of old shooters buying more guns.
Whatever... The worst is over now. Cabellas LaVista had loads of CCI Minimag in stock last week but I passed it by because I'm stocked up enough for my usage rate. As a family with Savage single shots and a Bearcat single action, we go for quality of shots, not quantity.