What I learned about drilling concrete

I, too, have a Bosch hammer drill. I use it to set gun safes up in concrete. I drill them slightly oversize, and put stainless all thread in a 2 part epoxy compound, and let it set for a day or two, then use grade 8 stainless hardware to bolt them down. 1 survived being rammed by a truck trying to make off with safe. The police followed the coolant trail to catch the bastards.