RCBS Neck sizing die ?

[LTH]

I neck sized my 3006 Nosler brass ( new ) because I found some high and low spots when spinning them on my Lee hand held case trimmer stud , ( I wasn't trimming them ) just checking things out.

Reading RCBS instructions, still not sure where an 1/8or a 1/4 turn is in relation to 7/8 s diameter.

RCBS says to adjust ram and die for cam over, so using some win. brass first and a sharpie , slight cam over hardly removed the ink , so I kept going until the ink was gone . I determine this as mid cam over.
I went further till it was a hard cam over.

Using the set screw as a reference, how much would an 1/8 or a 1/4 be ?

How much is too much ?

The rifleman journal says with bullet seated , the neck diameter should be .333" surprisingly I got .3325" on my dummy round I used for setting up my seating die.

 

[243winxb]

A neck die only needs to touch the shell holder. No cam over needed.

 

[LTH]

The distance from the set screw to the closest mark on the left is how much of a turn ?

243winxb, I did size with it just touching the shell holder with the die. The sharpie marks I put on there didn't scrape off until I took it down further.

 

[bush3755]

Standard 7/8x14 dies move about .072" per turn or revolution in the press. That's the reciprocal of 14, or 1 divided by 14. Looks to me like that closest mark is about 3/10ths inch to the left of the set screw.

One fourth (1/4) of a turn moves the die about .018" up or down depending on how it's turned; down if turned clockwise viewed above it. Way too much for good adjustment increments. Instead, turn the die relative to its lock ring a little less than 1/10th inch; that'll change the die position about .002" in the press. So, your adjustment to that mark means the die will change about 1/12th of a turn or .006" in height.

I found this interesting web site with instructions to use for adjusting dies in a press to the right setting to size cases properly:

http://s860.photobucket.com/user/jepp2/media/DieAdjustment-1.jpg.html

Were your case necks out of round or flattened on one side? If so, new cases can usually be run up into a regular full length sizing die with its decapping stem screwed down half an inch then the die put in the press half an inch higher than normal. That'll even out case necks quite well so they can be deburred in their mouths then bullets seated in them.

 

[LTH]

From the first position to the first mark read .004", I just used the depth probe.
That link was blurry from my phone ,I would like a clear image.

 

[243winxb]

That link was blurry from my phone

 

[LTH]

Thank you, Thank you

 

[witchhunter]

Use a sharpie and mark a stripe on the neck. Adjust your die to only size about 3/4 of the neck.

 

[LTH]

To the eye they looked great.
Since these cases are ready to go, I was just checking things out.
They fit snug and by turning them , I could feel the high and low spots or them being out of round using the stud from the Lee hand trimmer .

That's why I just used the NS die to true them up.

Not really understanding the 8th and 4th turn , I just followed the cam over statement.
I don't think I took it too far down , I did a first 2nd and 3rd cam feel and went with the 2nd , the 3rd was too hard.
I did this with win. brass for trial.

 

[LTH]

I colored the neck and the position I went with scraped it all off to the beginning of the shoulder.

Is this bad or too much ? Is it goofed ?

 

[gamestalker]

I adjust mine by using a sharpie line down the case neck. When I'm removing sharpie to almost the neck shoulder junction, maybe .030" above it, I lock it down right there. I also turn my brass 180 degrees and run it through one more time, but that's just a personal thing I've been doing for many years. You don't want to get into the shoulder.

GS

 

[LTH]

I measured datum to head before and after and nothing changed . So u guess it's OK .

 

[bush3755]

You can size a .30-06 case neck as much as you want with a neck sizing die. Leaving part of it unsized doesn't help center it in the chamber neck, but lots of folks think it does. New cases can have their necks resized in full length dies, too. That helps keep them straighter on the case body as the body is held in better alignment with the neck.

All the neck needs to be sized if a full length sizing die's used. Otherwise, the fired case shoulder will be moved forward a few thousandths and the bolt won't close freely on it.

 

[gamestalker]

Oops, wrong thread.

GS