Some 4/0 in Louisville. Plenty of it in Michigan. Louisville does have alot of 2/0sol. And the A wire. Well that **** is everywhere in Louisville and they do get new A wire for repairs.. Some of the stuff they have there you gotta get wire from a troubleman that's saved some and keeps it on his truck cause it's a ******* size and the don't stock it.. Mostly 6 A and 8 A wire is what they use though. All automatic sleeves and deadends sometimes bolt on dead ends..
When was an apprentice in the Toronto area 250 copper was a normal distribution feeder. I have seen a couple of 500 and I have worked on 300 copper as well!