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If it doesnt leave th chamber it will bump up when you hit it, but keen to know the result

Lots of ways to skin a cat!

Nothing wrong with your ears aye!

In my experience it won't release from the pipe, maybe highly polished SS? What are the expansion / shrinkage rates of the materials.
What about a slit tube inside a solid tube, pour your lead in...

Now that's real smart, I'm impressed

An easier way maybe to cast the lead into clay moulded with a stick of the right size the dried in the lovely weather we are having an broken off the solid lead, you should be paying for this...

Slit with a thin milling cutter weld in ends and hinge together like a spit roast, use black pipe