bobo - back to your original question. No, they cannot be reused as is, ie reloaded.
OK, before somebody jumps in, technically, you probably could. The problem is that they now all have rifling marks on them, which might screw your obturation, allowing propellant gasses to escape around the bullet. Very possibly they have grit embedded in the jacket and may even be distorted from impact, even if that is not visible to the naked eye. Firing them would at best be a very quick way to ruin your barrel and at worst a very good way to burst your barrel.
If I were in a Warsaw basement in 1944 with Jurgen Stroop closing in, yeah, I'd probably try it. In the here and now, not a chance.
Melt 'em down and toss the jackets - cheap lead for cast bullets. Or use them in a slingshot.