Post here what types of ammo you'd like to see in NV.
Also post if you are capable of creating the projectile models and/or pipboy icons for ammo types you want to see, as that would be a great help.
I'll lead off:
22LR-Shotshell. This is a little used round consisting of a hollow plastic 'bullet' containing an amount of tiny bird shot. Tends to foul weapons rather quickly, good only at short range, capable of hitting multiple targets at once. low damage, low penetration. good for wild animals.
22Mag-soft
22Mag-Full metal jacket
22Mag-hollow point
22Mag-hollow point, copper jacketed (I've shot chipmunks in RL with these...they launch off their perches like bottle rockets)
.45
.30-30
-.44-50