Muddydogs,
I never said it was the lubed bullet's fault. As I said in the OP, and you correctly repeated, the flare up startled me and I jerked. I regard any undesirable flying lead as a visit from the Tinsel Fairy, as I think most here do as well.
Thank God I've only had the steam/exploding kind happen once, very mildly, with no injuries. That was enough!