Redhawk,
When the accident happened he had pulled the breach plug and dumped the powder, but the breach plug opening was smaller that the sabot so it couldn't be pushed out, so they hit it and it went boom. Now the powerbelts from what I understand are slightly undersize so you might be able to push it out.
But I said not to pound it out because Myerslake2005 said he was thinking about it. Myerslake, let us know how it goes and how you get it out.
Greg