Your basic drill bit is ground in such a way that there is a relief angle
behind the cutting edge, which allows the bit to advance in the material
which is being drilled, with only moderate pressure being applied to the bit.
Lead, being very soft, does not require much pressure to be drilled. You have
found that out. The drill bit doesn't know it is being used on soft stuff,
but it still responds to the pressure applied to it, and really digs in. Try
an experiment, and grind your drill bit square, so it will not dig in. Likely
you will need to make a very shallow starter hole with a regular bit, so your
square-ground bit knows where it is supposed to go.

Pull the lead bullet, and make a replacement bullet from some dark,
close-grained hardwood.

Make a wooden bullet from some close-grained hardwood, and then paint it a
copper color, then coat with some good quality clear coat finish or epoxy.

toggle mother mode on, briefly -- if you are messing around with lead,
please be aware that it is sneaky stuff which leaves deposits on your
fingers, and consider washing your hands before eating or having a smoke.

mother mode off.

tom koehler

--
I will find a way or make one.

1) Try to stone a small flat at each cutting edge on the drill tip.
These flats will be parallel to the drill axis. This reduces the
relief angle to 0. You could even make the relief angle a bit
negative (1 or 2 degrees). The reduced relief angle will reduce the
tendency for the drill bit to dig in. Use a light touch, a bit of
lube, and clean cuttings frequently.

2) Get more and better advice from rec.crafts.metalworking. Those
guys know how to drill anything!

scritch