is reloading bottlenecked rifle cases really worth it?
Yes. But you need good equipment and have to shop for your components, and buy in bulk. Primers, bullets, and powder can be had for much less if you shop around. The Internet makes this a lot easier. You can store a lot of places in your favorites, and get on their E-Mail lists, and they'll contact you when they have sales and deals on certain items. Be prepared to buy on a moments notice, so have some cash saved up, and on hand for that purpose when the time and need come up.
Next is your equipment. You'll be a lot happier if you buy good equipment right from the get go, and not "trade up" later. Don't worry about the cost. The more you shoot, the faster you'll recover your investment. With factory .223 going for around $9.00 a magazine full, it won't take long. Other calibers like 9 MM are still cheap enough to buy and shoot factory. Just save all of the brass and sooner or later you'll be glad you did. This stuff is only going to get more expensive as time goes on.
Don't get caught up in things like case annealing. I haven't annealed a case in 35 years of reloading. Most of the time other factors will cause you to chuck the brass before the necks start to split. A good press, (progressive), a good powered case trimmer, along with a good method of cleaning your cases with a large enough capacity, and you'll be up and running in the right direction.
When you first get into this it will be difficult to justify the initial cost. You will be comparing it to ammo you can buy. That will pass after a couple thousand rounds, and the savings start to be realized. Most people who say they haven't saved much by reloading haven't approached it right. They don't buy good equipment, and pay too much for components. Buy good stuff and shop wisely for it, and you will see the savings, along with how much more you'll be able to shoot. Once you get going you will find you will always have enough ammo on hand, instead of having to buy it all the time when it seems you can least afford it. That keeps a lot of guys home, instead of on the range. Bill T.