Another thing that helps is when you are drilling the hole, run the
drill up and down a few times to ream out the hole a bit. Tapcons
have always worked fine for me--I've tossed a powder actuated gun in
the dumpster in a fit of rage before, so they sure aren't a panacea--
jams, spalling, underdriven fasteners are all problems. (unless you
spend the money and get a Hilti). For instances where you are
primarily concerned about shear, I like drive in pegs or rawls for
ease of use and low tech simplicity.. Using a manual screwdriver on a
tapcon sounds like a hard way to serve the Lord.
(a) used the right size drill bit and (b) drilled the hole deep enough,
there shouldn't be any problem, in my experience. I do rub the threads
across a bar of paraffin before installing them, (as I do with almost any
concrete or wood screw) but I usually just put Tapcons in by hand using a
nut driver or by using a socket on my cordless drill.
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