I've done lotsa reading about this - including this great thread - I've ordered some rubber pellet (Fiocchi LE) from Midway for my Shockwave for in-house use. I'm sure there are lots of arguments both ways - but I'll take my chances with the first round being non-lethal. I think it provides a better legal standing (I'm pure outhouse lawyer!) and I'm sure at across-the-room range that it'll put a hurt on anyone crashing into our place ...