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Charles,

Have you ever seen an expansion bolt, same concept. In this case inside the casing is a pin that looks similar to a roofing nail with its flat end up against the primer charge.
It sits inside a plastic sleeve that is held captive in the shell casing by a groove that has been pressed into the casing. The outboard end of the plastic sleeve that sticks out beyound the shell casing has a very small pilot hole drilled in it. When the Nail I call a ram is fired it travels to the end of the plastic and it is stopped by the groove that has been pressed into the shell casing.

You with me so far/ The Ram has a shaft that is 10 times the size of the pilot hole in the end of the plastic sleeve.
As it travels forward it expands the sleeve outward and hard against the inside surface of the firearms chamber effectivly locking the safety bullet inside the chamber. The nail or ram has traveled forward and beyound the end of the plastic end of the safety bullet and it has forced the plastic away from the center creating the friction bond between the plastic and the steel.

To remove the Safety Bullet you have to push the pin back inside the Safety Bullet and this will releave the pressure against the wall of the firing chamber and you can now remove the bullet.

If you like email me your fax and I will send you part of the patent application that will explain it in great detail.

Mike Worley inventor of the Safety Bullet
captjammin @hotmail.com