Uhhhh what? The components are MUCH easier to find at all times than the factory rounds nowadays. 200gr .358 caliber bullets are always in stock at pretty much every reloader supply house. Rem makes a run of the core lokt .30 and .358 cal bullets once a month. They just don't do full cartridge assembly of some of these "older" rounds as often as they used to due to other "higher" sales of the latest popular .223 (or 5.56) sucking the supply lines like a Hoover.

Having been a loader for the past 35 years or so I can attest to this fact. Besides, reloading is always better since you can tune your rounds to perfection for YOUR particular firearm not to mention that reloading is considerably more cost effective if you shoot often.