I looked at the magnitude 11.3 GC NGC6380 in Sco last night with a 12" Dob and an 8 mm Hyperion EP (188x). It was VERY difficult to see and only just visible with averted vision. The cluster is hidden by a magnitude 9.9 star which is on the edge of it. The distance to 6380 is about 32,000 light years. NGC6749 is the faintest NGC globular, and 6380 the second faintest.
The image is by Bob Erdmann.
www.ngcic.org