I'm under Bortle 6 skies and have a 120mm achro. I'm thinking I should be able to see the Blue Snowball, but I failed to find it last night. A check with Stellarium showed I wasn't quite looking in the right spot. That's usually the case when I fail to find something. I'll give it another shot and will also soon be heading out to near Bortle 3 skies. When I get in the right spot, will I be able to see it under Bortle 6? It looks to be under magnitude 8, and I've found mag 8 objects.
You need a nebula filter to see it better. An OIII or a UHC will help.