Reducing case neck run out

[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.

[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

[Chapuis]

Isn't this one of the reasons Lee put O" rings on the locking rings of their dies?

[ovenpaa]

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.

[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.

[dromia]

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.