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I have reliable reports of one shooter killing a feral goat with a multi-stroke pneumatic rifle, and another shooter inadvertently killing a deer with a cheap Chinese spring-piston rifle (he was trying to chase it away from the plants in his yard and caused a pneumo-thorax).
The Diana/RWS LP8, Beeman P1, Browning 800, and Weihrauch HW45 are spring-piston pistols that make around 6 foot-pounds of energy, are inherently fairly quiet (but not dead quiet) and require some dedication to shoot with high precision.
It was ignited by the hot air generated by the spring-piston mechanism when forced through a small valve (adiabatic compression).