It's my understanding that companies do runs of .35 Remington in time for deer season as there's little demand for this ammo any other time of the year. I'm guessing that there are also regional preferences. Here in NY, for decades, .35 Remington, mostly in the Marlin 336, was one of the most commonly encountered rifles in New York's deer woods, even more common than the Winchester 94.
It's a good idea to lay in a supply of brass or loaded rounds but I don't think this caliber will be discontinued any time soon.
