Necks getting fatter, how often do you check? How often do you turn again?

[Mulligan]

OK folks,
just had the life scared out of me.....

I haven't shot this rifle for a couple of months and loaded up a couple of powder ladders to see what would work in the summer heat. For some reason (providence?) I checked the loaded round diameter, I normally do not do this unless there is a reason to suspect something is a wry.

6 Dasher .271 NK
Lapua brass turned to .0125" when it was first prepped some time ago. Loaded round measured .2682", now a loaded round measures .2712" not all, some measure .2708".

I grabbed three fired cases out of the box and measured them, .0125-.013", I then resized them........ .0138-.014"
Holy Brass-flow Bateman!!!


How frequently do you re-turn your brass?
Do you check each time you load? I know I will from this day forward!

CW

 

[DHuffman]

I used to skim about every 5 or 6 firings but I've gotten lazy about it.

 

[JFrank]

If the necks are getting thicker shouldn’t you notice a change in seating force ?

 

[mikecr]

Do a lot of FL sizing?
What is your typical trim rate?

 

[Shooter13]

I've had this happen and it is not pretty! I trim to length pretty often but the neck size still grew.

 

[Mulligan]

Do a lot of FL sizing?
What is your typical trim rate?

Yes, I always full length size my dasher brass. I takes a long time shooting a couple of matches a month to get my dasher brass to grow much in length. I suppose I trim once or twice a year. A match important to me or .003” variation in length and I will be trimming.
CW

 

[Mulligan]

If the necks are getting thicker shouldn’t you notice a change in seating force ?

Not sure I would notice. From one case to the next, they are all about the same. It is the change over time that got me. Although I have and use a K&M arbor press, I seat be feel….. I rarely even look at the gauge unless I feel something that gets my attention. Except for large differences in seating pressure needed to seat a bulllet, I cannot shoot the difference in seating pressure so I do not pay much attention to it.

CW

 

[Straightshooter1]

OK folks,
just had the life scared out of me.....

I haven't shot this rifle for a couple of months and loaded up a couple of powder ladders to see what would work in the summer heat. For some reason (providence?) I checked the loaded round diameter, I normally do not do this unless there is a reason to suspect something is a wry.

6 Dasher .271 NK
Lapua brass turned to .0125" when it was first prepped some time ago. Loaded round measured .2682", now a loaded round measures .2712" not all, some measure .2708".

I grabbed three fired cases out of the box and measured them, .0125-.013", I then resized them........ .0138-.014"
Holy Brass-flow Bateman!!!


How frequently do you re-turn your brass?
Do you check each time you load? I know I will from this day forward!

CWView attachment 1352435

How many firings on those cases? Loading with HOT loads?

This makes me wonder if there's something going on with your sizing die bushing allowing a lot of donut growth??? With that particular tool I would take measurements closer to the neck-shoulder junction and close to the case mouth to see if there's some kind of taper.

I've not seen any such growth in neck thickness in any of my .308 cases (like I've got 11 firings on some Federal brass that I turned and used what I'd characterize moderate to hot loads). 19 firings on Lapua brass also with no change. 6.5 PRC cases with 6 firings of hot loads, no changes to date and are annealed and FL sized after every firing (same for .308 cases). I don't use busing dies.

 

[Clancy]

In the words of Turkey Creek Jack Johnson…

“Hell I ain’t ever even heard uh nothin like that.”

 

[JEFFPPC]

I return necks about every 6 loadings, more or less. Except brand new brass after the first 3 or 4. What puzzles me is some you get dust while others I shake my head and say, where did that come from. It keeps seating pressure even which is how I figured out it needed done to start with.

 

[BORGY76]

What kind of turning systems is everyone using?

 

[Straightshooter1]

What kind of turning systems is everyone using?

I use both the hand held Sinclair and PMA neck turning tool along with the 20th Century case holder with driver, which I use with a variable drill and typically run it at ~700 rpm. Both the Sinclair and the PMA do a great job, but I like the PMA better as it's easier to make adjustments.

 

[Clancy]

I use both the hand held Sinclair and PMA neck turning tool along with the 20th Century case holder with driver, which I use with a variable drill and typically run it at ~700 rpm. Both the Sinclair and the PMA do a great job, but I like the PMA better as it's easier to make adjustments.

View attachment 1352498 View attachment 1352499
View attachment 1352500

You took the words right out of my mouth. It takes 20 minutes to set my Sinclair, and it’s hard to get it perfect. The higher end tools are just so much easier to adjust.

Disclaimer: I’m still pretty new to neck turning. I still think it’s fun!

 

[BORGY76]

The Sinclair just takes care of the outside correct? The idod looks like a good solution, but expensive.

 

[Clancy]

The Sinclair just takes care of the outside correct? The idod looks like a good solution, but expensive.

You can get an inside cutter as well.

 

[Straightshooter1]

The Sinclair just takes care of the outside correct? The idod looks like a good solution, but expensive.

The IDOD is about as good as it gets. . . except for the price. But, that's normal as really good equipment is never inexpensive.

Yes, the Sinclair and the PMA just do the outside. I've not found that to be any kind of a problem when using expander mandrels on fire formed annealed brass.

 

[Mulligan]

I return necks about every 6 loadings, more or less. Except brand new brass after the first 3 or 4. What puzzles me is some you get dust while others I shake my head and say, where did that come from. It keeps seating pressure even which is how I figured out it needed done to start with.

This is good information, thanks
CW

 

[Webster]

OK folks,
just had the life scared out of me.....

I haven't shot this rifle for a couple of months and loaded up a couple of powder ladders to see what would work in the summer heat. For some reason (providence?) I checked the loaded round diameter, I normally do not do this unless there is a reason to suspect something is a wry.

6 Dasher .271 NK
Lapua brass turned to .0125" when it was first prepped some time ago. Loaded round measured .2682", now a loaded round measures .2712" not all, some measure .2708".

I grabbed three fired cases out of the box and measured them, .0125-.013", I then resized them........ .0138-.014"
Holy Brass-flow Bateman!!!


How frequently do you re-turn your brass?
Do you check each time you load? I know I will from this day forward!

CWView attachment 1352435

6BR for GH hunting. No turn. I usually turn after about 4-5 firings. Always removes some brass. No-one mentioned where the brass comes from. The shoulder must be getting thinner. Never had a case failure other than a couple split necks.

 

[JEFFPPC]

I used the Siclair tool for years but since I bought the PMA the Sinclair gathers dust. The PMA tool has repeatable accuracy, I like it a lot.
.

 

[tmwinds]

I have close to 50 firings on a set of 30 BR brass. The brass was turned for a .328 loaded round. It is still measuring .328.
When I turn the brass I turn into the shoulder a considerable amount to remove the donut left from the forming. As the brass flows from the body when firing and sizing it flows to the turned area in the shoulder and eliminates thick necks. I use a 45 degree cutter. I use a Forester tool.