Thread: Cartridge ID please

That second rimfire cartridge with the diameter of 7.8mm and its .303 looking rimmed base I’m guessing is some obscure forgotten to history entrepreneurial effort to convert a Lee Enfield into a garden gun. Probably used with a chamber insert?. Im only guessing. Looks as though it dates from the 20s-50s being a paper cartridge which puts it in the period the country was flooded with surplus .303s. Not a bad idea to have your deer rifle double as a shotgun for small game