Originally Posted by Black Tail Hunter
If you choose to crimp Lee makes a handy factory crimp die that isnt all that expensive and does a pretty nice job.
If you measure the neck and find you are only slightly over where you want to be you can sometimes get a little better neck tension by polishing the expander ball. Use flitz and a felt pad on a dremel and polish the hell out of it, the reduced friction when you pull the neck down over the ball after sizing will render slightly more neck tension.
I think I'd go the fl bushing route, be more precise in general There's a lot to consistent neck tension, annealing your brass is a good thing.
Polishing the expander ball may work, but if you happen to remove material from it, you could end up with some dilapidated piece of crap that will create runout you may not be able to rebound from.
Sometimes the only option is to spend money, and I'd steer clear of crimping. I've seen a crimp bring a semiauto load in, but there's a lot more constraints with a semi.
Also, I've never heard of setting a die by a line on the case neck, you want to set your die to bump your shoulder just enough to feed in the gun, regardless of any said line. Unless you're actually neck sizing only.