I feel pretty sure that this plant is a beautyberry (callicarpa) plant. But I'm not sure what species. From what I've been able to look up so far, there are several different species that are used in gardens and landscaping. I'd like to know which one this is!
This photo was taken Oct 30. Since then some of the berries have started shriveling on the plant but today there were still many plump berries on the plant. I can take additional photos or inspect the plant or briefly taste the berries if that would be helpful for ID.
I looked around online for a while and found lots of photos of different species and cultivars, but I didn't find a definitive guide for distinguishing the different kinds.