I use a Pionjar (sp) gas powered rig. What dia hole does your bit drill? How well does it work?
Mark
I'm getting 7-8" cut in my Ground here, and anticipate same out on the range (where we shot). Looks like the Taper upward tends to eject small rock, out at a proportionate angle, so I may have to rig a guard above the rascal.
On can make the sucker any size, within reason, I'd venture, sure makes a nice ROUND hole, ....
GTC