Re: Reloading equipment
Essentially, when using a threaded die, there's too much slop in the mateing of the die and the press for them to be alligned "perfectly" by simply screwing the die in and locking it down. By measuring the neck runout first to insure you're starting out with little to no neck runout, you can find out if your die is making things worse. Find the high spot on the case neck (if there is one) and mark it with a marker on the body of the case. Try to find a repeatable spot to line the index mark up with on your shell holder and then neck size the case. Remeasure the case neck. If it has the same amount of runout in the same place, you're good. If it has more runout, or the runout it has is in a different place, back the die out of the press, rotate the locking collar an eight of a turn or so. Lock it down and thread the die back into the press. Grab a new piece of brass, and repeat the process. The Hornady style locking rings are perfect for this... They clamp to the threads, rather than dig into them. I wish Redding would get their act together and send the dies with that type of collar. Anyway, keep futzing with it untill you get thing aligned. If manipulating the die doesn't get the job done, you can try rotating the shell holder too. My .243 IMP cases and die require the die to be in just such a spot, and the shell holder too. When they're where they need to be though, I'm getting consistant .0005" bullet runout and very tight groups as a result. Did I mention it doesn't hurt to do the same procedure with your seating die?
Hope this clears thing up a bit. If not, let me know.
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