The following happened to a shooting buddy some years ago:
Testing his Model 700 with some newly loaded 30-06 cartridges, my friend noted that the bolt closed exceptionally hard. As a precaution he opened the action, and the case went spinning out, sans projectile, drooling powder on its way. "Huh", says he. "I think the bullet's stuck in the rifling. Musta seated it too shallow".
Here's where it gets weird...
He takes another cartridge, pliers out the bullet and inserts the charged case into the chamber with the intention of shooting the bullet out the conventional exit. This case also makes the bolt difficult to close, but he remains undaunted. He tucks the rifle under his left arm, his back to the muzzle, and presses the trigger. I took refuge behind his jeep. (Somebody'd have to drive him to the hospital, ya know).
Click. Nothin' No bang. No pfffttt! Nada.
"Huh", says he again. Examining the case, it was apparent that the firing pin didn't contact the primer. So what are we gonna do? Eyeballing the radio antenna on his jeep, he unscrews the shaft to use as a makeshift ramrod. Unfortunately, the ball at the top is too large to go down a .30 caliber hole, and he spies a fairly straight twig on the ground, roughly 1/4" in diameter. Pushing that down the barrel, the twig breaks off slightly below the muzzle crown with no hope of removing it with the only other tool he had - the Bullet Pulling Pliers. So, we gotta go home and handle this with more sophisticated equipment.
A pair of needle nose pliers from his garage quickly removes the twig (close to 15 inches long BTW), and inserts his cleaning rod into the barrel. The weight of the aluminum rod alone was sufficient to dislodge the bullet, and all was right with the world once again.
I learned to make DAMN sure my own loads were of the proper length, checking each one with dial calipers after they came off the press.