Interesting stuff lead.. it has no elastic properties at all, and acts more like a liquid at room temperature. It also behaves the same way as red hot iron..
This is a major issue when you try and replace lead bullets with brass or other metals.. lead distorts or breaks up when it hits something and does not bounce back. Other metals do not, and have a nasty habit of ricocheting considerable distances..
s'Why when shooting at steel plates (not advised to do it at less than 5'ish metres range) I use copper plated rather than copper jacketed bullets. Certainly focuses your attention when the targets effectively start shooting back at you.
I have personally observed the effects of various rounds hitting kevlar, observed, not experienced. When examined it was interesting to see that the lead bullets deformed into flat mushrooms and you could clearly see the weave of the fabric weave (K29 I vaguely recall) imprinted into the lead. Whereas copper jacketed rounds were still more or less the same shape as when fired.
A chap up in Telford made use of the squishability of lead compared to harder materials and developed a round to pierce soft armor. I simple terms he had a load of lead bullets cast with about a dozen of what looked like half inch long steel nails within the lead. The effect was that the soft armour would stop the lead as intended, but the dozen little nail like object passed straight through the weave into the [in our case] ballistic gel.
Back on topic though:
The chap at plumbing school used to go on about "moving the metal" and we, as typical students, used to give it "yeah, yeah". However, once you get a bit proficient at working with metal you start to notice the movement and gradually start to be able to control it quite well. I also managed to do it with copper sheet too to a limited extent - copper is workable, but become brittle so realistically you have to plan on folds, overlaps and soldered joints if using it for roofing. All 20 years ago now, I'd make a real pigs ear of if if I tried it now.
I bought my Jap waterstone for knife sharpening after watching