http://air-ordnance.com/smg-22-eh-ai...ian-compliant/
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That's a heavy pellet, I use 14.3 and alloys get much lighter. Mine is rated at 800 fps with that pellet or 950fps with alloy, to give you a reference of sort. So cut it in half and up to 75 fps difference.A lighter pellet could easily be over 500fps even if it could used a a single shot. I'd stay far away from that, that's asking for trouble big time.
Cheers
The velocity is not the only thing that makes it a firearm, you need to be over 500fps and 4.5 ft lbs of muzzle energy, this takes into account all pellet alloys.
http://www.rcmp-grc.gc.ca/cfp-pcaf/f...me_air-eng.htm