Well, that’s kind of a funny thing if you stop to think about it. .35Remington has been obsolete for a long time - at least as far as numbers games and data chasing is concerned. I’m pretty sure since the .357Magnum and later the .358Winchester came out, the .35Rem has been outdated for velocity and muzzle energy. There’s nothing much a .35Rem will do that a .350Legend won’t, either. In terms of numbers, at least. But it’s still around. Because it’s a hunting round. Hunting isn’t about spreadsheets and statistics, it’s about meat in the freezer. The .35Rem keeps putting meat in the freezer season after season, so it’s never really going to be obsolete.
35 Remington fan myself, I keep sending messages to Starline asking if it's in their plans to offer brass. Hopefully one day my subliminal messaging will work. They do offer some more obscure cartridges so maybe the time is coming.
Depends a lot on your chamber. Marlin bratwurst reamed chambers split hard brass real quick. In a Contender super tight chamber with pistol pressure loads you might never have to buy new brass. Depends.
Isn't 35 Remington easily made out of 30-06 brass or is that something else
I'm going out to the man cave here in just a little while and pulling the cartridge conversion tables on 35 Rem with drawings. That's a good question and I know, by heart, most all of the reforming conversions for the major flavors ... but for the life of me I cannot think of 35 Rem at the moment. If 30.06 does the trick then likely so will .308/7.62x51 ... but I'm just not sure.