I do a lot of environmental drilling, been at it for 18 years now. When ever we have drilled sandstone, it drills very easy compared to any other type of rock. When digging into it while excavating, it tends to crumble in irregular pieces. Remember, it is just compressed sand. There aren't regular planes for it to fracture along. At least that's how the sandstone around here acts.
Your plan to drill into it with a hammer drill should work just fine. Its just time to do it. Drill a series of holes in a certain area and hit with your sledge. See what it does. Go from there. If it doesn't work, then go get bigger tools. Your time is cheap, sounds like getting bigger tools would be more expensive. I usually go the cheap route first even if it takes me a little time to do it.
I have a huge limestone "decorative" rock in my front yard. I've tried to break the edges off with a sledge, not happening. Anyone want a free rock?
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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