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Markers in rock and concrete

Recently got a battery powered rock drill for TAPCONS.  Tested it on pure limestone yesterday as an acid test for use in concrete.  Drilling was fine with  5/32" rock bit. But near the end of screwing in the 3/16" x 1 3/4" anchor, the head torqued off.  Tried it again slowly and got in about 1" before chickening out.  Does anybody know of a "screwable" anchor that would work better?

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