"Gunner Asch" wrote in message
...
On Fri, 30 Dec 2005 03:14:56 GMT, "Tom Gardner"
wrote:

So far, everybody else has offered brute-force sollutions. I'll bet this
is
faster and easier. Center punch the center, draw a circle 7/64" smaller
than the finished hole, prick marks on this circle 1/8" apart, use an air
drill and 1/8" stub bits and drill these holes, knock-out the slug,
clean-up
with a tapered reamer, finish with a sized reamer.

If you are really careful, a .243 winchester will make a nice
.308-315 hole in a frame. Might have to grind off a little crater wall
...

Maybe there is (or could be) a tool that could do this; small shaped charges
and something like the concrete nail thing that you hit with a hammer to set
off the cartridge.