f8s and even overhands often untie, I use a barrel knot pulled tight. A double overhand knot is pretty good too, and give you a loop to clip to, or to clip to the anchors.
I don't understand why 60 and 70m ropes are popular in Australia; we have few trad pitches over 50m and few sport pitches over 25m. I think raps should be planned for 50m ropes (25 or 50m) unless there's a really good reason to go bigger.
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