Well if I was still on speaking terms with that 'particular string maker', so's I could get him to spin up a couple of strings from it, I'd let you send that stuff to me. [&:]
I watched him make a few nitro strings and that stuff was pretty particular about how you layed it up. You couldn't just whip it around the jig like you can with any of the non-braid string materials. It was imperative not to let the braid twist as you went around the pins on your jig or it would create pressure points along the string that definitely would cause it to abrade and cut itself. I don't have the patience to fiddle with it that much.
I know what you mean about it seeming stretchy in your hands, but it was a braid. I don't think the strands stretched. When you pulled on it, it closed the little gaps between the individual strands. Kinda like those Chinese finger cuffs we played with when we were kids. Remember those? Stick one finger in one end and and another finger in the other end and then try to pull 'em out. The mesh would pull taut and tighten down, clamping onto your fingers so you couldn't pull out of it.
Once a properly laid up nitro string was on the bow and under tension, I didn't notice any stretch at all while shooting. Certainly nothing like dacron. You know how rubbery dacron feels on some bows.[:-] But it did seem hard to get the correct string length, especially on longer strings.