I don't have a Ghost Ring and really don't know the diameter of them.
However, for a lot of years,I have huntdde with the aperature taken out of my peep sights and just use the trreaded hole. That is about .190 dia. I know a lot of others who do the same.
On targets, I use a samller aperture for finer sighting, but using it for hunting cuts down the ability to quickly aquire the trarget and the hunam eye will automatically seek the center.
