I prefer the d-75, I often weave 4 strands fastflight into my linen strings for insurance. I recently have been trying silk, lots of stretch, very similar to b-50. The natural strings are nice to shoot but are much fatter and a tad slower than the modern. Last year at the flight shoots I entered a primitive bow in a modern class and shot a fast flite string, 353 yards, I switched to a linen string and entered the same bow and arrow in the primitive class and got 343 yards, not a big difference.