I made a video of stuck bullets, not one but two. I double loaded a second bullet and immediately caught it with my WITNESS MARK. My first ever after 50yrs of shooting the muzz.
This was in my custom inline and not a side hammer. A breech plug was made with the grease fitting. After the original breech plug was removed AND POWDER DUMPED OUT THE ACTION, the breech plug with the fitting was installed.
I used a much larger hand pump. It worked........... HOWEVER...... no where near as easy. I had to use a cheater bar to get enough force. I'd let each pump set and work its hydro pressure, then pump it again. This worked to a point, when the hose on the pump burst. I ran to the parts store for a new hose fitting and started up again. I had a plastic bag over the end of the barrel, as I had no clue how those bullets and grease may fly out.
It took a long time to get those bullets to move and quite honestly, I thought I'd break another hose. Finally things started to move, yet still a very slow process.

Boys and girls........ that's stuck!

I tried uploading the video last night but the darn thing even this morning was only at 48%. Nuts to that.
There was zero damage or issue inside the bore. Just took a number of patches to push out the majority of the grease, then I used grease remover to eliminate all traces. Then of course made sure that the barrel was properly lubricated.
I've been lucking in all this time. I dry balled just once, and then the above. Doesn't matter how long you've been at it, it like they say, 'Its not if but when".