You really can't predict the pricing or availibility situation which are related. At this point you can only guess. My guess would be that you will see the same disparity in pricing between ammo, but that all ammo will stay at higher levels than those pre-panic. I am not saying they will stay as high as now, but they will be higher than what they were before Newtown. How much higher is anyone's guess, but most likely it will be at least 10% - 20%, or even a bit more.
All bets are off if there are importation bans, ammo taxes, outright ammo bans, etc.