I have some U-shaped brackets that I'm nailing into a 4x4 post. The
brackets will hold a 2x4 stringer. The nailing hole in the bracket is
in the base of the "U", and it's hard to nail the nail without
damaging the surrounding legs of the bracket. I've been using a
nailset. Is there any technique to make this easier or any piece of
equipment that will help? I'm wondering if a framing nailer could
drive a nail right through the metal into the wood.

Any thoughts appreciated.