Yesterday was somewhat chastened to find that my doubled 30m rope did not actually reach the ledge on the big pitch in Swinsto, in contrast to many previous trips. Neither did the other one. I assumed I had made a cock of things, age probably.
Both came off a recent 200m drum that measured at 205m. I have always cut new rope with a 10% allowance (literally measuring out 11m and calling it 10), which has always worked fine. I have just remeasured all the rope with a survey tape to find the error, and the grand total is now 172m. That’s a lot of shrinkage. Even assuming it was 200m that is 14%, but it is 16% measured. So “30m” becomes 27m.
I like the rope, but that seems slightly odd.