In the old days there was no such thing as 'sorta' 'kind-a', when it came to firing mercuric primers the case was brittle as soon as the trigger was pulled. SO? If the reloader was going to use mercuric primers and wanted good mileage out of his cases he would galvanize the inside of the case.
And if anyone wondered about what happened to the barrel when mercuric primers were used? The barrel started rusting as soon as the atmosphere contacted the inside of the barrel so it was not easy to clean the barrel fast enough. And I have some stuff that removes cupronickel, the streaker bullet; anyhow, read the instructions before poring down the barre.
F. Guffey