What's the chance of this?

Usually squibs are (especially if they're jacketed) but this bullet was poly coated lead. Also a little undersized for the bore. I suppose that's why the friction was low.

Even though I usually clean with a bore snake, I also keep a rigid cleaning rod in my range bag. Sure came in handy this time. It didn't take too much force to get it out, just a firm push.

Another view. Nuts, right?

Hahaha that’s nuts