That's interesting.
I suspect with open weaves today, the lack of strength in them is the let-down.
Whether the "grease" used as noted in the text, damaged the powder or not, we don't know. Back in the 80's, I used a barrier wad of card stock to protect the powder
from the mink-oil(grease) on my patches, as this seemed logical. In testing, I found no difference so stopped using one. In the smaller calibres, .40 and .45, I found the
barrier wad effected accuracy, but did not do so in the .69.