"a round stuck in the barrel"
From that statement I assume you mean you had a bad load, and when fired the ball when only part way down the barrel and got stuck, correct?
If so, rather than unscrewing the "breech plug", you might want to try the less invasive old time method.
You might try a ".50 cal black powder bullet puller":
http://media.midwayusa.com/productimages/880x660/Primary/673/673644.jpg
Attach it to the end of a cleaning rod, and screw the end into the ball.
The brass ring is non-marring in the steel bore.
Once screwed in good, pull it out!
Or, you might try a "CO2 bullet discharger":
http://www.buffaloarms.com/ItemMedia/10024/10024_44151.jpgRemove the nipple (if a percussion action), and shoot the blast of air through it, pushing out the bullet (have it pointed in a safe direction!)
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