I have a 16" VMATCH, topped with a Leupold VariXII 3-9x40 Tactical. First time out, zero'd at 100 with some older Win. 55gr match. Got sub 1" groups - 5 shots. Next time out, the thing was shooting waaaaay off. Long story short, I was using Burris high Z rings, they must have had uneven flex on the flattop. Put on a Bsquare one piece riser mount and now it purrs! Shoots Q3131~1", Malaysian 88 mfg,lot 19 and 22 ~1", Win. 45gr. hp ~3/4", and Black Hills 68 gr. match 5/8" avg., long as the wind is calm. The range usually is pretty windy, with gusts that turn your groups to sh*t.