Magnitude estimates at such extremes were notoriously inaccurate in the 18th and 19th centuries. NGC6342 is located SSE of M9. Image is a mosaic of six Digital Sky Survey downloads. Map Printable Map More info. M9 More info.
Larger aperture helps.
Dreyer states that NGC6304 contains stars of magnitude 16. More recent sources give 14.2 photographic magnitude. It, too is described as well resolved, with stars of magnitude 16. In spite of the similar brightness and stellar magnitude descriptions, this one is harder to resolve than its companion. Image is a Digital Sky Survey mosaic.