Not having the best summer here, but then summer is never the best conditions for seeing.
If you are serious about determining limiting mag go to the International Meteor Orginisation site and get the tables.
http://www.imo.net/visual/major/observation/lm
The best I've ever seen was off the scales and at least 7.6 I was out in the wheatbelt in May for that one. Also remember a memorable night in early August when Hale-Bopp was around. I've also heard of a realiable observer reporting 8.0 from altitude at Machu Picchu in the Andes!