I've ran 250 .223 rounds. I have 5 where the bullets are loose at the case mouth. I tried to re-crimp, with no luck. Anyone encounter this before? I pulled the bullets and they measure.223. I'm loading 55gr. Hornady Spire point, Hornady once fired brass, on a Dillon 550. I'm thinking maybe over chamfering? I use an RCBS chamfer tool attached to a drill.