When it comes to feeders all I've ever worked with is XHHW-2 with aluminum conductors or much more rarely - due to cost - THWN-2 and copper conductors.
In no circumstance did I ever experience meaningful damage to the nylon jacket.
It was the smaller branch conductors rated THHN/THWN-2/MTW that suffered. Poor pulling geometry from time to time scraped the jacket in a nasty manner.
Normally I stopped the pull the minute this happened. Typically the damaged wire was rejected and a fresh pull was started. We're talking #10 for home-runs, typically.
My logic was: no way can the company make money pulling warranty replacements AFTER the store is up and operational.
So it really gets down to how much your reputation means to you -- how much you can afford for warranty call-backs.
As for myself, I eliminate the problem by not scoring the conductors -- no matter how much effort that takes.
