It's taken me a while , but here is the results of trying out the dacron line.
I'm pleased with the performance of the dacron, on the overall, I'd say for me it is worth the cost to purchase the line. The line is somewhat flatish, not perfectly round, has practicly no stretch. There is a little stretch, but that is due to the braid and not the material.
Here you can see the line is two piece, and outer sheath and an inner core. The inner core is also braided, but not as tightly. This stuff melts very much like nylon. The lack of stretch makes it necessary to "mushroom" the end when melting it, this will help to hold the knot. (I use only a half hitch to tie the line to the pouch.) There is no problem with the line being too thin.
Here is the hank of Dacron with a smaller hank of 1/8" nylon. It gives some idea of the size.
This image again gives some idea of the size of the dacron. (The knot is a half hitch, but loosely tied)
This is one of the slings made from the dacron. Iv'e had no problem with line twist. The stuff is not to limp nor to stiff. It's easly rolled up and put is an pocket, and yet does not tangle up very much, a nice trait to be sure.
I love the looks of the bradided slings, but for an easly made sling, this is all you really need, leather, some cord, and a bit of dowel.
Here are my two first dacron line slings. The longer one is 34" long and the shorter is 27" long. I like the shorter more, but they both work well. The longer I've found needs a stone of more exact size, to large and it takes too much effort to work well, to small and it's not heavy enough to get good flight. The shorter sling is more forgiving of stone weight variation. These slings make quite a bit of string noise, they really cut throught the air. I would not want to have to hunt with it. The dacron seems to be somewhat less resistant to abration than nylon, but not overly so. It may be due to lack of stretch.
Bottom line.
I would buy this stuff again. I'm gona make more slings from it, it seems fast, and is easy to work with. It's not perfect, but If I were to try inventing a cord just for making slings this stuff is what I'd be shooting for, (or maybe slinging for). 8)
Hope this is some help to someone.
WalkingBird