No, I haven't because I have Elektrisola's specs on every kind of wire thats been made since 2002 among the modern PE offerings, including what MWS sells now, Essex, REA, Korean PE, a few others. Plus every vintage sample of PE I collected over ten years, multiple PAF examples, P90's, a Nocaster, 50's steel guitar from Fender, P13's, minibuckers, CC pickup, CBS Strat etc. etc. So all the wire I currently have new and old I have lab specs on. I just plain don't use it in practice, it was highly educational to see that up until 1965 PE was different then it changed more to what we buy now. I mic every new roll to make sure nothing changed and I QC all my pickups so if there's a sudden change in final reading I know something is wrong or the wire changed. But since Elektrisola makes PE now there have been no variations in wire I buy. When REA was making wire it changed every six months and screwed me up many times. I don't know exactly how Elektrisola's lab reads ohms per foot but they were able to do it on cut off coils with not much length at all. I've only done a measurement once and ran out about 20 feet of new and vintage wire and even then there was a difference, but I realized its just too hard to control a consistent temperature in a home environment so didn't pay alot of attention to it. Just the fact that you're breathing near it or have a light on near your work would invalidate things if you want to get picky. My own work table lights always heat the coils up enough that the readings change from winder to work station. All my pickup recipes are turns counts and I know each one by heart and know which wire to use. Ohms per foot was just a research tool, just like insulation thickness and bare wire sizes of vintage wire were, but in day to day production I don't use it at all.