Being involved with archery for over 50 years I've tried many things to make me a better archer and bowhunter. Living here in the Upper Penninsula of Michigan there weren't any archery shops so you learned to make it yourself. I've been making strings for almost 45 years and for Ron LaClair the last 3 years. When we came up with mixing B-50 and 450+ I said, "why not". Randy Gustafson of Northwoods Wilderness Outfitters and I experimented with different string materials (He's got about 10 Shrews) and found 6 strands, 450+ 2 strands, B-50 padded to 14 strands worked the best for every Shrew we tried. People are asking does it work on recurves--YES--I've had one on my Marriah Thermal for 2 years now and looks as good as the day I put it on. Does it come unraveled NO!!
B-50 will stretch as far as the 450+ will allow it. All I know is it works on the Shrew's. Give it a try you might get your bow to shoot as good as a Shrew, well then again maybe not!!