A vaccine will certainly help. But I have read that ammo manufacturers feel they got burned after they spent a lot of money buying expensive equipment to increase their capacity only to have the market and prices collapse in 2016. They do not intend to make the same mistake this time. I have no doubt they will be running their existing lines 24/7 after the vaccine if they are not doing so already. But given the pent up demand it is going to take a while for supply to catch up with demand.