This one seems to work pretty good.
A couple medium sized ones.
HW50S-.22, L3-9x33 EFR, sub zero or something laser light.
Usually I'll get 5-8 in a hours time around the farm. They won't stand in the green light long and you have to be fast on the trigger. A plus is you can see there eyes back in their hiding spots and pick them off inside them.
They also disappear and stay that way once you get a couple.