The thing about Caliche is it's damned ELASTICITY, The chit soaks up energy like rubber,.....and "Shearing" it, whether with a tool or explosives is a bit of a challenge.

Ours out at the range falls into the 'Blue Caliche' realm,....and in places resembles flexible limestone,...no kidding. I LOVE drilling problems,....any driller worth his salt should, I reckon.

This particular "Shallow Hole" tool would really light off with rotary percussion,....but is adequate just with the re-cip,....we're just concreting in little stubs of square tubing, and not going very deep.

This will save us a small fortune on target stands, in the long run, and worth the effort.

GTC

Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain