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Re: Fence posts in limestone I frequently need to plant a pole for a satellite dish which has a big sail at top of 6' pole so needs a good foundation
I swear grapes must love rock hard soil because wherever there are vineyards around here, the ground is miserable to dig in
I use an electric jack hammer and small phd
Often times I put a long 3/4" masonry bit in my drill and make a hole or two to give my j-hammer a fracture point - really helps sometimes
I further suggest that you abandon the pre made fence panels - they require pretty precise post placement and digging a hole in rock and adjusting can be a lot of additional hard work
Use schedule 20, 2 3/8" OD fence posts set in concrete
Using 2 bolts per post, bolt a vertical 'stud' on either side of post so that the horizontal members of your fence will align flush
You may likely save some effort on the digging end of project using steel posts and spend most of that time saved in doing the bolting part (which has a lot less sweat in it)
You will also save some $$ building the fence vs buying pre made panels and end up with a sturdier longer lasting fence
If you go the electric j-hammer route, keep in mind how much extension cord you will need
The hammer needs lots of amps and you will need a cord capable of carrying the load
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