Ok, not trying to contradict what sounds like good advice, but fwiw I've had a22 lr stuck in a heavy wall barrel a few times...tinkering w/subsonics.
I've pulled a bullet, removed aound 50% of the powder and dislodged it with no damage. Yes, dangerous practice, however RWS & Eley don't use much of a crimp...wear safety glasses!
I can see how a stationary bullet, engaging rifling, will take a lot of pressure to get moving, but a reduced powder charge (1/4?) shouldn't generate more pressure in a barrel where the chamber has effectively been lengthened (i.e. bullet stuck 12" down the barrel)...I'd speculate that the "larger chamber" would make the pressure curve more gradual, along with only a fraction of the propellant being present.
I can see that there are a lot of variables with wall thickness, etc, but has anyone else tried this and had negative results?
In the case of a primer-only load in a hangun, where it may only have started into the barrel or cone, sure just whack it out.
If you have to use a primed case with hardly any powder and do this multiple times, will it be an issue? Physics professors on board?