Yup when I read the initial posting I was sure of the answer as I did it myself once this year but the bulge was visible and I could also feel the swell. It's good you found the solution Streetdoctor.

To prove how tightly the case neck holds the bullet just borrow a inertia (hammer type) bullet puller and see how many raps on a block to even move the bullet are needed.

BTW folks how do I make up a signature that inserts on the bottom of my posts?