Turning necks

Stats Shooter · April 29, 2017, 12:03 AM

I'm curious as to the degree of consistency y'all consider acceptable for neck thickness. I haven't been turning necks for too long but with my setup, about the best I can do is within 0.002. That's certainly a lot better than un-turned necks in some brass which I have seen having a spread of 0.007 or 0.008.

I have certainly noticed a difference in accuracy with turned necks. Mostly in the absence of flyers.

tangolima · April 29, 2017, 07:05 AM

Are you measuring the neck diameter or neck wall thickness?

I measure the neck wall thickness at several points around the perimeter. My standard is 0.012 +/- .0005". For brass with thin neck wall, I do 0.01 +/- .0005".

-TL

Metal god · April 29, 2017, 12:00 PM

.007 to .008

I have to say that's more then I've ever heard of . That's .004 on each side , I don't even see that being possible , you would be able to see .008 with the naked eye . I think the most I've seen was a total of .004 . I may be misunderstanding what you're saying though .

Stats Shooter · April 29, 2017, 12:09 PM

Quote:

That's .004 on each side , I don't even see that being possible

Yup...0.0185 and 0.0115.....But not on the same case, that was the variation in neck thickness from brass of a lot of Winchester I had

tangolima · April 29, 2017, 12:22 PM

0.0185" is too thick. Guess that's why you turn neck. Too thick for the loaded round to chamber. Worst case is the bullet is clamped in by the neck of the chamber and causes high pressure when the gun fires.

0.012" is my norm. Sometimes I need to reduce it to 0.011" for tight chambers.

-TL

Metal god · April 29, 2017, 01:03 PM

I see , I thought you were talking one case had a .008 variance . I was thinking holy cow I could see that just by looking at it .

Stats Shooter · April 29, 2017, 01:07 PM

I agree, too thick. What you will find is one side will be 0.017 or something, and the other 0.014. and the next case 0.015- 0.0115.

They'll chamber but it will be snug....Sort of a crimp via throat . And then you'll wonder why you have fliers.

It isn't like that with premium brass. But the cheap stuff can vary quite a bit

April 29, 2017, 12:03 AM	#1
Stats Shooter Senior Member Join Date: August 26, 2016 Location: North Dakota Posts: 1,636	Turning necks I'm curious as to the degree of consistency y'all consider acceptable for neck thickness. I haven't been turning necks for too long but with my setup, about the best I can do is within 0.002. That's certainly a lot better than un-turned necks in some brass which I have seen having a spread of 0.007 or 0.008. I have certainly noticed a difference in accuracy with turned necks. Mostly in the absence of flyers.

April 29, 2017, 12:00 PM	#3
Metal god Senior Member Join Date: April 10, 2012 Location: San Diego CA Posts: 7,135	.007 to .008 I have to say that's more then I've ever heard of . That's .004 on each side , I don't even see that being possible , you would be able to see .008 with the naked eye . I think the most I've seen was a total of .004 . I may be misunderstanding what you're saying though . __________________ If Jesus had a gun , he'd probably still be alive ! I almost always write my posts regardless of content in a jovial manor and intent . If that's not how you took it , please try again .

April 29, 2017, 01:03 PM	#6
Metal god Senior Member Join Date: April 10, 2012 Location: San Diego CA Posts: 7,135	I see , I thought you were talking one case had a .008 variance . I was thinking holy cow I could see that just by looking at it . __________________ If Jesus had a gun , he'd probably still be alive ! I almost always write my posts regardless of content in a jovial manor and intent . If that's not how you took it , please try again .

April 29, 2017, 07:05 AM	#2
tangolima Senior Member Join Date: September 28, 2013 Posts: 5,175	Are you measuring the neck diameter or neck wall thickness? I measure the neck wall thickness at several points around the perimeter. My standard is 0.012 +/- .0005". For brass with thin neck wall, I do 0.01 +/- .0005". -TL

April 29, 2017, 12:22 PM	#5
tangolima Senior Member Join Date: September 28, 2013 Posts: 5,175	0.0185" is too thick. Guess that's why you turn neck. Too thick for the loaded round to chamber. Worst case is the bullet is clamped in by the neck of the chamber and causes high pressure when the gun fires. 0.012" is my norm. Sometimes I need to reduce it to 0.011" for tight chambers. -TL

April 29, 2017, 01:07 PM	#7
Stats Shooter Senior Member Join Date: August 26, 2016 Location: North Dakota Posts: 1,636	I agree, too thick. What you will find is one side will be 0.017 or something, and the other 0.014. and the next case 0.015- 0.0115. They'll chamber but it will be snug....Sort of a crimp via throat . And then you'll wonder why you have fliers. It isn't like that with premium brass. But the cheap stuff can vary quite a bit