I've tried compressed aluminium foil "crumple" bound with veg oil as a body filler. Seems to work, and have some potential, but I don't do cosmetic repairs so I havn't tested it extensively.
If I ever have to make, say, an intake manifold, as in replacing my dodgy Aisin carburettor with 3 Nikei almost-like-SU-that-I-almost-understand-and-can-adjust motorcycle carbs, that might be a useful role for it.
As a projectile I think you'd need to be pretty close to the target. Wasn't clear from the video if it was spreading on impact dum-dum stylee, but it'd seem a possibility, though even then I'd doubt it offers any real advantage over casting the aluminium.
I think you can get lead foil that might be more effective. Wern't toothpaste tubes made out of some kind of heavy foil in the '50's/60's?
Incidentally from the chat on the range the guys seemed to be saying there was a "trend" for Americans to say (and presumably spell) aluminium correctly ("That's what the kids are calling it").
I thought about loading with rock salt. Less lethal and more painful. Win win.
I think rock salt is more wives tale than anything. According to this test, you'd have to be within 10-12 feet for the salt to have enough energy to penetrate skin. That's way too close for comfort, although possible in a home defense situation.
I get your less lethal being a win comment. However, if a bad guy is in my house and lethal force was justified, I'd rather scrape his remains off the walls than make him mad with some salt on the skin.
----------------- 1990 Nissan 300zx VG30DE - PP Euro 0W-40 2004 Nissan Quest VQ35DE - PP Euro 0W-40 2003 Ford Excursion 7.3 PSD - Rotella T6 5W-40 2005 Ford Taurus 3.0 Vulcan - Havoline HM 5W-20