Originally Posted by GreyEclipse
Dang, thought this was gonna be a blonde joke.
You need a barrel that is approved for slugs.
Yours most likely isn't but maybe you should call Mossberg and ask.
Nonsense. Any modern shotgun barrel (and by modern I mean made in the last 100 years) is 'approved' for slugs. They're just big chunks of lead, not nuclear warheads.
Here's a good primer on shotguns and chokes and slugs... http://en.wikipedia.org/wiki/Shotgun