I hope I've not missed a name while I was reading through the posts here but didn't Holloway manufacture actions for the trade .?
I'd guess that it's an unclear subject too, as some makers had made their own actions at one point but opted to buy in at other times.
There's also the possibility of a firm buying in barrelled actions or complete guns for their cheaper models but still making their best guns in house.

Rust never sleeps !