just bought a used v match upper,my varminter upper is to heavy and i want save it for shooting with friends.i already know the 16 is not as accurate as the 24 but what should i expect from it at 100 yards.it is 1/9 crome lined and what ammo works best?

I've had good success (1moa)in my 16" with just about every brand of *quality* factory ammo, i.e. expensive.  There's a big difference when stepping down to PMC plinker stuff.  Even better in the fluted 20" I sold a few months back.

Also making a difference would be the use of a bipod (Mine are Harris), optics, and a good match trigger.   There's a lot of potential with the little V-Match.  

I have a bush Vmatch with M4 16" barrel and TA11. With great 52-55 grain match or similar ammo I manage roughtly 0.8" at 100yds from bench. With Q3131 I get 1.8" or so.