Forgive me if this has come up before. I have done a search prior to posting but can't find anything.
A firearms dealer has told me that I can have a lot of inexpensive shooting by buying a .223 and using "cheap military" ammunition in it.
Now I know that the calibres are identical, but I think there are subtle differences in the profile of the casings and also the thickness of the brass, if a long and boring American You tube video is to be believed.
I would value your informed opinions please.