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 smaller 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.
That has been precisely my experience. I discarded the smaller apertures the first day in the field in favor of quicker, brighter acquisition on the animal. Came in handy on my first muzzleloading bull, taken at 15 feet.
