Hold on a sec, the only "bullet" that should produce a curve within NV combat distance is .44 special.
Mine isn't a bullet, its one of these... http://www.taser.com/products/law/Pages/TASERXREP.aspx
(And its also home made from salvaged electronics, so I envision it as being not exactly ideal weight).
The round shocks living targets and shorts out robots (does about 25 damage too). People take minimal (nuisance) damage, and get knocked out for a variable duration.