7.62 ball?

found a 7.62 ball ( tagged as ) …F A 52 red purple (faded) ? tinned case … cantalured bullet …crimped ring primer…no part seems to attract a magnet … how early is this or …??

That is a Cal .30 Light Rifle T71E1 High Pressure Test. It will have a 172 grain GM bullet. Predecessor of the M60.