I've done my share of work in late 1800s vintage dwellings. The foundations will commonly be 18" to 24" limestone that was set with low portland mortar. Occasionally, I'll have to attach to poured walls with large (fist sized) sedimentary stone fill.
I've found that the stone generally grinds down the thread of the concrete screw into a conical shape. The thread at the tip of the screw gets ground away the most.
The screw will grip so hard that the shaft will twist off at the head. Backing the screw out a turn and setting it two turns, repeatedly, will help to get it in without breaking the shaft. Then removing the screw and chucking it, and inserting a fresh one, will complete the installation.
Fortunately, I've had little granite to have to deal with in my area.
