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Ricko, I used "9mm training ammo". It is a polymer case and polymer bullet with a small aluminum case head. I used the German stuff, but there is a Swedish version too. I never fired a full powered round through the set-up. I do a lot of testing of firearms and material failure issues, so I knew what the risks were. I can't go into significant detail, but suffice it to say, we were able to dispatch slaughter animals with the set-up with about 95% one shot kills after a few tweaks to the ammo.
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That finally makes some sense. I'm sure a .22 Short would work about as well.
Actual 9mm pressures would have left you standing in a cloud of plastic.
That's the real problem - there doesn't seem to be any way of rifling non-metal so the gun could be legally constructed. And illegally constructed plastic guns have existed a long time.
Did no one see "In the Line of Fire" twenty years ago? Sure it's a movie, but the resin design of that gun was pretty straightforward. Used an old .38 low pressure round.