Neck turning for a beginner

[nksmfamjp]

Just started neck turning, first does the depth into the shoulder look correct for my cut? Also, is it common with new unprepped brass to get an uneven cut on the shoulder like this? Thanks!

We’re all answering your question, but I think we are missing 5 key pieces of information.

What is the case shoulder angle?
What is the cutter angle?
What is your loaded round neck diameter before firing?
What is your fired case diameter?
What is your neck thickness variation? Usually taken as 3 measurements per case on ~30 cases. What is the Sd of this measurement?

 

[6BRA]

Stacked tolerances play into this as well in regards to cutting into shoulders. Necks have to be turned on sized brass to get your standardized length. Here are your variables with stacked tolerances. Dies/chamber/ matched angle cutter...if the angles aren't matched..you may have variations into cutting into the shoulders. Just watch how deep. I feel like this is the over annealing thing...hard to over anneal.

 

[Preacher]

How about that wobble if you chuck up in a hand drill and use a hand held turner ;]

That is not a problem it goes with the flow....

 

[Ajwilly96]

We’re all answering your question, but I think we are missing 5 key pieces of information.

What is the case shoulder angle?
What is the cutter angle?
What is your loaded round neck diameter before firing?
What is your fired case diameter?
What is your neck thickness variation? Usually taken as 3 measurements per case on ~30 cases. What is the Sd of this measurement?

What is the case shoulder angle? 23deg
What is the cutter angle? 23deg
What is your loaded round neck diameter before firing? Unsure
What is your fired case diameter? It should be .2527
What is your neck thickness variation? Anywhere from 11.5thou to 16thou

 

[dcali]

Don't cut into the shoulder. That's a good way to leave the neck of the case in the chamber. Just barely touch it with a very light skim.

 

[dcali]

Piggy-backing this newb thread with another newb question....

Trying to decide if I should get into turning necks.

I'll prolly run 3-5 matches a year. F-class, 600 / 1k, some long range precision 250 - 1000 yds. Mostly in it to see if I can beat myself. W/o turning necks I'm 0.30 - 0.35" at 100 yd. 6 Dasher. Peterson brass. Rest of my shooting with be fun matches / private range time.

What kind of accuracy improvements etc can I expect? Worth it for me?

It's not very important. There is a long list of things to work on before going to the cost and time suck of turning brass. Many matches have been won with unturned brass. For context, my F class .223 uses unturned Norma brass. It routinely shoots in the .2s with a tuned load. It shoots in the .3s with pretty much any load. This is with plain old Berger bullets.

 

[Webster]

Just started neck turning, first does the depth into the shoulder look correct for my cut? Also, is it common with new unprepped brass to get an uneven cut on the shoulder like this? Thanks!

Way to much. You just touch the shoulder. Looks like you didn't rread how to do it before you started. Go to the tech section on this web site and look up case prep. There should be a good picture. To little is better than to much.

You are being redirected...

www.accurateshooter.com

 

[6BRA]

Way to much. You just touch the shoulder. Looks like you didn't rread how to do it before you started. Go to the tech section on this web site and look up case prep. There should be a good picture. To little is better than to much.

You are being redirected...

www.accurateshooter.com

So your saying DJs and myself have turned too much....hmm..ok guess case separation is in my future. Brass is too hard to come by. Gonna run it til its broke then. With this mentality all cutters should be 50 deg cutters. Once you get to the neck shoulder junction...STOP!... I MEAN WHY ARE DIFFERENT ANGLE CUTTERS MADE? YOU HAVE TO ASK YOURSELF THESE QUESTIONS...and because everyone is scared shitless...you follow the norm. I would love for Pat at PMA to chime in...

 

[Webster]

What is the shoulder angle on the brass, and what angle is your cutter? If you go with a steeper cutter than your case shoulder, it will limit how far down the neck the cutter will comtact. As @Bill Norris said, yours is too far down.

Unless your rifle is tight neck and requires turning before you can fire them, you are better off to fire the brass once before turning. I reformed some 30-06 brass for my 25-06, so I had to turn before firing. Here is how they turned out.

View attachment 1483705

Nice photo examples.

Added later. Picture of a cross-section from the AMPS website. Imagine how thin the shoulder gets if you cut into it.

 

[JFrank]

I was a bit nervous the first time I tried neck turning for a bra but with a .268 NK I had to do it.
Trimmed all the brass on my Wilson tr, and followed Pats ( PMA ) instructions, they seemed to turn out ok.

 

[6BRA]

I was a bit nervous the first time I tried neck turning for a bra but with a .268 NK I had to do it.
Trimmed all the brass on my Wilson tr, and followed Pats ( PMA ) instructions, they seemed to turn out ok.

You turned 30 deg with 40 deg cutter? That's what it looks like before blowing to 40 deg shoulder. Did you lose crush cutting that far? Or did you jam?

 

[JFrank]

No, I cut with a 30 degree prior to fire forming, just about one revolution into the shoulder, still leaving a crush fit just not enough to require forcing the bolt closed. I jam the rounds but it wasn’t really necessary, I could use a tissue stuffed into the case neck and still form a nice shoulder.

 

[6BRA]

No, I cut with a 30 degree prior to fire forming, just about one revolution into the shoulder, still leaving a crush fit just not enough to require forcing the bolt closed. I jam the rounds but it wasn’t really necessary, I could use a tissue stuffed into the case neck and still form a nice shoulder.

I would have turned twice. First pass prior to fireform and stay clear of shoulder to leave full crush. The beauty of the bra is simplicity in fireforming. With crush..there is no need to jam. So simple. After fireform, another pass to clean up into shoulders with 40 deg cutter. Worked for you. They look good.

 

[Dave M.]

I was a bit nervous the first time I tried neck turning for a bra but with a .268 NK I had to do it.
Trimmed all the brass on my Wilson tr, and followed Pats ( PMA ) instructions, they seemed to turn out ok.

Nicely turned necks.

 

[nksmfamjp]

What is the case shoulder angle? 23deg
What is the cutter angle? 23deg
What is your loaded round neck diameter before firing? Unsure
What is your fired case diameter? It should be .2527
What is your neck thickness variation? Anywhere from 11.5thou to 16thou

What do you mean by should be 0.2527”? I’m confused. What cartridge is this?

 

[Ajwilly96]

What do you mean by should be 0.2527”? I’m confused. What cartridge is this?

Sorry, I thought you were asking about case neck diameter.

223

 

[David Christian]

Unless I am solving for a specific neck clearance or need to remove/prevent a donut, neck turning is not needed for what I do and to shoot really small groups. I would rather buy a better barrel, clean up the ignition, or fine tune my load development.