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I got some Colibri rounds to shoot out of my Amphibian. These are only 20 grain lead projectiles with no powder.
You can literally shoot them indoors into a BB gun trap. They only have a primer in the rim, but they are still accurate. I only shot them at 20 feet, but they probably are accurate out a little further. Photo below shows the Colibri on the right, next to a .22LR on the left.
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They won't cycle the bolt, so you have to cycle each round by hand, but with the integral suppressor and the bolt closed, the ONLY THING YOU HEAR IS THE BULLET HITTING THE PAPER TARGET.
I am not kidding. It is really, really cool. I giggled a little bit.