I'm running Lil'gun in a pistol length adjustable gas system. I ran the load down as far as I could go without keyholeing at 100 yards. I get a slight keyhole at 200 yards.
Normally I run the 150's at 1850ft/s with Lil'gun but I wanted to play with a light weight subsonic that would cycle...but this gun will cycle a sneeze it seems.
I'll probably shoot the light weights on some coyotes and see what the data says on some meat targets