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Reducing case neck run out
Posted: Sat May 14, 2011 8:29 pm
by ovenpaa
I have been having problems with case neck run out on my 7mm, it was not consistent and I would see anything from .0005" to .006" or worse which was annoying as I use the same dies (Forster) and process for Christel's 22-47. I picked up a tip from another forum that works. Basically instead of locking the die down tight to the press slip a suitable sized O-Ring onto the die and tighten down on that, this means the die has the ability to move (wobble) very slightly. Testing today immediately took my run-out down to typically under .001" and often better than .0005"
A 2p component saved the day and I am very impressed so thank you very much Mr Taylor.
Re: Reducing case neck run out
Posted: Sat May 14, 2011 9:17 pm
by 20series
I was over visiting Ovenpaa and Christel today and was shown this in action,
I commented that I often get issues when resizing, the die is tight on it's way back out, Ovenpaa gave me a coulpe of O rings and I tried it when I got home and it has helped that issue as well.
Alan
Re: Reducing case neck run out
Posted: Sun May 15, 2011 7:04 am
by Chapuis
Isn't this one of the reasons Lee put O" rings on the locking rings of their dies?
Re: Reducing case neck run out
Posted: Sun May 15, 2011 8:55 am
by ovenpaa
Chapuis wrote:Isn't this one of the reasons Lee put O" rings on the locking rings of their dies?
I always though they did that to act as an alternative locking method but yes I think you are quite right. Thinking about it my Lee dies have always given me excellent run out results.
Re: Reducing case neck run out
Posted: Sun May 15, 2011 6:33 pm
by Chapuis
I can't be bothered to go and look at the Lee reloading manual now but I'm fairly sure that Richard Lee makes a claim for improved alignment due to the O" ring on his dies. While I take some of his claims with a small pinch of salt he's probably telling it straight up on this one.
Re: Reducing case neck run out
Posted: Sun May 15, 2011 6:44 pm
by dromia
Chapuis wrote:I can't be bothered to go and look at the Lee reloading manual now but I'm fairly sure that Richard Lee makes a claim for improved alignment due to the O" ring on his dies. While I take some of his claims with a small pinch of salt he's probably telling it straight up on this one.
I concur.
Ovenpaa you just re-invented the wheel. :lol:
Hope that Lee don't sue you.
