.30cal Luger cartridge

[unspellable]

Water works for hardball or slow moving solid lead bullets. I've done it myself with a 455 Webley.

If you have anything with serious pretensions to expansion, it will expand in water.

I've captured wax bullets in cotton. Did the ballistic pendulum thing in college physics. Can you imagine packing a revolver on campus in today's climate? (Maybe I'm giving away my age.)