It appears the shotguns started shooting slugs on the skeet shooting levels instead of birdshot. That makes the Skeetpocolypse daily challenge today a little harder than usual. Must have changed when they did this last update.
Play a level like Behind Bars that has an easy gold and takes less than a second to get. Just do that 10 times, come back an hour and a half later and repeat. Going from 13-15 shouldn’t take more than 2 days.