Hi again Ian.
Just had a look around.
Apparently, if you find a piece of brass bar, just under the calibre size, you can drill a hole in the end of the bar, and hard solder a drill bit in the end.
Add a "T" piece on the other end to turn the bar.
The drill protuding from the end of the bar should be no longer than two pellets!
The idea being, you drill the pellets out( BY HAND ) one at a time, in bits.
Hope that makes sense buddy, and helps.
ATB.
Bill.