mrjbloomington - I just recently bought a 7-08. I have the means and know how to form cases from 308 brass. Having been down that road before with other cases, the only way I would do it again, is if I could not get the brass, the brass was unavailable (out of stock) or the brass is sooo expensive that reforming makes sense. 308 brass costs some where around $40/100 now. 7-08 brass costs around $45/100 - to me $5/100 is not worth messing around with. I bought brass for my 7-08. Unless you have a stash of 308 brass already that you do not know what to do with; personally I would not mess with it. It might be simple manner of lubing and running through your die and trimming, but if they are once fired brass, you may have to anneal cases before sizing, you may have to turn necks, depending on your rifle. You may want to turn necks any way, because when the necks thicken through sizing, they may not be uniform. Like I said, I avoid it when practical, even $10/hundred, is not worth it to me, even when it is a simple sizing job. I have done it, it is a learning experience, and I will do it again, but only if I have to.
KansasPaul - As far as I know; the only 22 Jets being made any more are through the Custom shop at T/C. Dies can be purchased, however. Cases are available (expensive, but available) as are bullets, they take standard .224 bullets for most guns built in the last 20 years, like the T/C. Cases can be formed from 357 brass as well, but be prepared for a bunch of work. Stimpy alluded to this. He formed his brass. The The original 22 Jets in the Model 53 were of a smaller diameter. They used bullets in .222 or .223. They can still be had, but at a premium price. The guns are another problem. Originally they were for a S&W revolver (model 53) and they quit making those years ago. Stimpy had a Handi rifle in 22 Mag rechambered for his 22 Jet. Or you can still get them in a T/C either a short or long barrel through their custom shop. T/C is a good way to go if you are looking to shoot a lot of obsolete cases. As far as making brass, that is on a case by case basis. The best thing to do is buy a couple of reloading manuals that have the cartridge you are thinking of and see if you can form them from some thing else. Unless they are real old, most times you can get brass, dies and bullets for them. It may cost you a bunch, but they are generally available.