According to this Guns.com article, Winchester Ammunition expects the sales to be steady. Sales were down a bit, but is remaining higher than 2012. Backlog was lower than 2013, but still higher than 2012 as well.
Link: http://www.guns.com/2015/02/08/winchester-expects-post-surge-ammo-sales-to-remain-steady-in-2015/
From: Guns.com