Re: Neck turning for a factory rifle?
Yes the brass will get a little thicker but mostly it will get longer.
recently I bought Winchester brass for my 220 swift and before neck turning it, a loaded round measured .264. Holy thick Batman. I turned them down to .015 on a side. This is a factory chambering and .264 is about the exact neck size. These cases went in tight. I didn't like the idea of shooting them so I pulled the bullets. I'd be afraid of selling brass that was that thick for use by the general public. Anyone who shoots an already hot load would be put over the top.
I guess when you reload, you should expect to check everything out before pulling the trigger. Even when my brass was .013, I turned them to .012 in order to make them consistant. Did it help, probably not. But, it doesnt' hurt either. Recently I was told by someone of an article they read and it's message was a very interesting point about "Hobbies". This one in particular (shooting/reloading) fits the statement well. "Have fun with your hobbies and enjoy all the things you do for what they are at the moment. Stop making hobbies into a job and looking only at the end results. The trip is part of it too."
In other words, sit in a comfy chair and turn necks!
If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!