Neck turned brass on no turn/factory chamber.

[PhilC]

I'd turn them to about 75% cleanup, anneal, and fire away.....

The 75% skim turn is what Fred Sinclair recommended decades ago, I still do that for my factory chambered rifles.

 

[Webster]

Turned brass in a no turn chamber is going to start losing necks from overworking the brass in my opinion.

I turn my Lapua 6BR cases for a no turn chamber without any short life of brass. Opinions are not facts. New cases are about 0.0135' I turn to 0.0125'. I have a little over 20 firing on each case. I anneal brass.

 

[alf]

I turn my Lapua 6BR cases for a no turn chamber without any short life of brass. Opinions are not facts. New cases are about 0.0135' I turn to 0.0125'. I have a little over 20 firing on each case. I anneal brass.

Also depends on what your "no turn" chamber is.....

 

[Bora72]

In a no turn chamber, Id only turn the high spots and not a total cleanup. Turned necks in a no turn chamber expand farther than normal and get worked too much.

Hi, thanks for the advice, it always depends on how much space there is in these no turning chamber.

 

[Bora72]

I usually only turn necks before the first firing, so the brass is as soft as it's ever going to be. If your brass has already been fired once, it may help to anneal it first. The act of turning necks on it's own doesn't require annealing again afterwards.

Thanks for the details

 

[Bora72]

I turn my Lapua 6BR cases for a no turn chamber without any short life of brass. Opinions are not facts. New cases are about 0.0135' I turn to 0.0125'. I have a little over 20 firing on each case. I anneal brass.

Hi, what's the chamber neck measurement? And your loaded ammo neck?

Thanks

 

[Bora72]

Also depends on what your "no turn" chamber is.....

Exactly

 

[Will Henry]

Hello, I've recived from a friend a mixed quantity of 6,5x47 Lapua brass.
These brass are from vary number of firing, vary lot...
These are a Babele batch brasses.....

The neck thikness variance are about from .123thou to .132thou (some cases also on the same neck), so I think to turn all the neck cases for a little bit of consistency .123thou.

My chamber are factory no turn and the neck diameter of fired case a are .294"

I have the stuff for neck turning.

I anneal my brass at any firing.

Have some type of issues to fire neck turned cases like I plan on my .294" neck chamber?

Thanks and Happy new year!

I'm a little confused about your dimensions. You can't possibly be saying there is .009" variation. I have never seen that in any brass. As far as neck turning is concerned, it will do no harm and properly done, may be of some benefit. In theory, concentric necks of a consistent size will result in straighter ammunition and more consistent sizing. If I had brass which varied too much, I would sort it first and toss any widely varying pieces. WH

 

[No i deer]

My 6.5x47 is a standard chamber..
I just turn off the high spots..
My 7mms are tight necks..
After consulting one of the good f open shooters I turn my necks a fraction more as he'd tested the clearance on a loaded round out to 10 thousandths if my memory serves me right..
5 thousandths either side.
He runs about 5 thousandths now..
2.5 thousandths either side..
I'm not sure what my necks are off hand but the brass got turned a little more than usual..
Bushed down that bit more and neck tension mandrelled to the desired tension.

 

[Bora72]

I'm a little confused about your dimensions. You can't possibly be saying there is .009" variation. I have never seen that in any brass. As far as neck turning is concerned, it will do no harm and properly done, may be of some benefit. In theory, concentric necks of a consistent size will result in straighter ammunition and more consistent sizing. If I had brass which varied too much, I would sort it first and toss any widely varying pieces. WH

Hi, actually, now that you've pointed it out, I mistyped the thickness measurements. Regarding your comment about the thickness variation I measured on new Lapua cases, I'll take new measurements this evening or tomorrow when I get home, but I don't think I'm too far off, but anything could be...

 

[L.Sherm]

I'm like Will I'm confused on your numbers. If you turn your brass to 0125 and your neck is .294 you should be in the neighborhood of .289 loaded round for .005 clearance total- .0025 per side if that's the case your totaly fine.

 

[Bora72]

My 6.5x47 is a standard chamber..
I just turn off the high spots..
My 7mms are tight necks..
Afternoon consulting one of the good f open shooters I turn my necks a fraction more as he'd tested the clearance on a loaded round out to 10 thousandths if my memory serves me right..
5 thousandths either side.
He runs about 5 thousandths now..
2.5 thousandths either side..
I'm not sure what my necks are off hand but the brass got turned a little more than usual..
Bushed down that bit more and neck tension mandrelled to the desired tension.

Thanks for the input. I'm not sure if the chamber is now narrower in the neck area? After turning the case necks, do I also need to re-tighten the neck tension on the bullet?

 

[Bora72]

I'm like Will I'm confused on your numbers. If you turn your brass to 0125 and your neck is .294 you should be in the neighborhood of .289 loaded round for .005 clearance total- .0025 per side if that's the case your totaly fine.

Yes, I made a mistake in writing the measurements.
If I completely return the necks they are at .01225" so a little more clearance....

 

[searcher]

I can't think of a bigger waste of time and money than to obtain all the tools necessary to neck turn, setting up the tools, and then only cleaning up 75% of the neck, like you're leaving some kind of safety margin just in case. Especially when it will only take another .0005 off the neck to do it. Factory chambers already have like .006-.008 of clearance to start with. It's not going to hurt a damn thing to clean them up 100%. Does anyone only uniform and clean 75% of their primer pockets? Or trim 75% of their cases? Or clean only 75% of their cases?

I tend to agree, but some lots of brass have some really crazy outliers that are much thicker (or thinner), creating velocity errata. Getting rid of those few can mostly fix those - but 100% clean is better yet, IF one is willing to toss the ones that are way too thin - otherwise one can end up with necks that are much thinner than desired, something I don't like in a semi-auto as the necks can actually "tweak" a bit on loading. Even in the bolt guns, I'll toss the thinnest few, which it seems there are always a few that are thinner than I want to turn everything to. That isn't so common on the better brass.

 

[Will Henry]

In bygone days (50 years ago) we established the thickness to which we turned the necks, by turning so that a turned case would be sized to an internal diameter .001" under the size of the expander ball. This was before bushing dies were commonly available, you understand. So, neck thickness was determined by sizing die dimensions. If the chamber was a tight necked one, neck thickness was determined by chamber dimensions. Today, everyone has bushing dies or collet dies, so sizing die dimensions can be tailored to the brass. WH

 

[Webster]

Also depends on what your "no turn" chamber is.....

A no turn should be 0.272". A few make the reamers to 0.273". No big deal.

 

[Bora72]

I'm a little confused about your dimensions. You can't possibly be saying there is .009" variation. I have never seen that in any brass. As far as neck turning is concerned, it will do no harm and properly done, may be of some benefit. In theory, concentric necks of a consistent size will result in straighter ammunition and more consistent sizing. If I had brass which varied too much, I would sort it first and toss any widely varying pieces. WH

Hello, I maked some new measures on new brass.
Variance are about from .01260" to .01335" on a batch of 20 case.
Center range are about from .01270" to .01315"
The max variance of neck thickness are about .00075"

 

[NF1E]

Love this stuff. Doesn't mean I am going to start turning again. Love looking at the tools sitting on the shelf. Since using Lapua brass, that equipment has been laying dormant. Maybe time for more testing. Feels really good to know I can, should I make that choice. Whatta Hobby!