I inherited my dads 16 ga wards hercules single barrel. I gave it to my youngest son so I can not look for markings on it. If it is 16 a 12 ga won't fit and a 20 ga goes down the barrel it has to be a 16. I doubt that they made a 28 ga.
My brother also had one but lost the fore arm in his military career travels. His son had my dads fore arm for quite a while but I do not know if he got new metal for the forearm machined out or not. It seems like the forearm had a hole in the metal with a couple of pieces of sping wire that slipped over a pin to hold it on.
I will get ahold of my son with dads hercules and have him look at it for markings
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