I shot my Colt light weight last weekend with a VX6 1-6 scope and IMI M193 ball ammo.yes a chrome lined pencil barrel and FMJ ammo.

Shot 10 shot group, no cooling but I did notice I was aiming low and adjusted. Still shot a 2.5" group at 100 yards.

The thing that I was reminded of was a few 3 shot "groups" were under MOA and the rest could've been called flyers. That's why 10 shot groups matter.