Putting a hole in a frame rail.
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
...
Now see, you didn't read the post! He wants a 5/8 hole! I don't know of a
projectile that will leave a 16mm hole or a "powder-actuated" punch would
have been my first choice.
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