Probably between 80 and 90. As low as 77 or 78 and as high as 94 or 95.
I play a lot of golf at Bear Creek Golf Club in Murrieta, California (~7100 and 75.3/143.). Tom Pernice Jr. is a member and plays there all the time. He shoots 67 - 70 most rounds and will go slightly lower than that when he plays well. He plays with "The Guys" all the time in the Friday and Saturday skins games when he's in town. I generally shoot 70 to 76 on that course when my back is feeling okay unless it's set up very difficult or I have a poor round.
Three or four weeks ago, a local top mid-am, Steve Nichols, shot a nice 64 at Pernice, and I think Pernice shot 68 or 69 that day.
Last year's U.S. Mid-Am champ, Womack (I think that's his name), shot two rounds in the 80's. I have played against two U.S. Mid-Am champs and a U.S. Publinks champ: Danny Green, Greg Puga, and Tim Hogarth, and in any given round I am capable of beating them, though they are going to get the best of me most of the time in a four-round tournament.
I'm sure Mucci is going to have a cow at my statement, but so be it. I have no doubt that I could shoot in the 80's at Augusta in today's conditions, and even in the 70's if I putted well.
There's at least one other player on this board (and probably others) that I know could do the same thing: Andrew Biggadike.
Oh yeah: To shoot anything decent, I'd have to take a cart, because walking that course would give me a frickin' heart attack! LOL!