case neck seperation

P

profesional 111

CGN Regular
Rating - 100%
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Location
west of Prince Rupert East of Japan
25/06
30/06
300wm

one year . all have had neck seperating completly from the shoulder.
hornady brass .
lapua brass
rws brass.

bin reloading 20 years without an issue. What is my issue now.
two of these are second time loading.
rws brass maybe had 4 loads . 300wm.
300 wm I have had the odd case crack down the neck before.

but three different calibers in one year . same problem ?
am I doing something wrong with my dies?
same dies forever.
using older rcbs lube on older green lube pad.
300 wm is max charge with no pressure signs . shooting a ragged hole @ 100 .
other two loads are mid chart. with no other signs of pressure..

any info would be great.
thanks Chris.
 
There are few possiblilities:
- Change in cleaning solutions for the brass. This might weaken the brass. I believe an ammonia based solution would do this.
- Change in how you clean your brass. For example, if you have gone to a system that scrubs out the inside of the case necks to bare metal, then it is possible that the bullet becomes bonded to the case. When fired it sticks.
- Something in how you are reloading? Very rare, in my experience, to have case neck cracks on a .300 Win Mag before you get case separations.
I had similar problems years ago with one batch of .308. I cannot recall what was the cause, as I threw out the cases that had the problems and have never had it again.
 
Sounds like thin neck brass being overworked by the die. Are you FL sizing every time or NS?
Annealing might help, or a bushing die with minimum sizing for it to hold a bullet.
Measure the OD of the neck on a fired piece and a sized piece and tell us what the difference is.
 
I would start here ... at least one set would work for 25-06 & 30-06

I would reduce over working your brass ...
https://www.redding-reloading.com/i...&Itemid=15&id=35:competition-shellholder-sets


Competition Shellholder Sets
Makes every die a custom die!

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ITEM NO. 116XX (5 pc. set includes storage box)
 
Are you cleaning your brass with SS pins and a solution?
If so, the insides of those necks may be super clean.

Subsequently, seating a copper alloy bullet in the very
clean brass can result in a metallurgical bond between
the bullet and the case neck, particularly if the loaded
round is not fired for several weeks.

When it is fired, the bond is strong enough to separate
the neck from the case, leaving with the bullet.

I had this issue with new Starline brass in my 38-55.
Trying to pull unfired rounds was virtually impossible,
due to the bond that had occurred.. Dave.
 
Eagleye said:
Are you cleaning your brass with SS pins and a solution?
If so, the insides of those necks may be super clean.

Subsequently, seating a copper alloy bullet in the very
clean brass can result in a metallurgical bond between
the bullet and the case neck, particularly if the loaded
round is not fired for several weeks.

When it is fired, the bond is strong enough to separate
the neck from the case, leaving with the bullet.

I had this issue with new Starline brass in my 38-55.
Trying to pull unfired rounds was virtually impossible,
due to the bond that had occurred.. Dave.
Click to expand...

very interesting . because i never had an issue with any new loads that were right of the bench . they were all loads that worked great before. then i used them months later and had the issues.
This may be part of my problem.
chris
 
Eagleye said:
Are you cleaning your brass with SS pins and a solution?
If so, the insides of those necks may be super clean.

Subsequently, seating a copper alloy bullet in the very
clean brass can result in a metallurgical bond between
the bullet and the case neck, particularly if the loaded
round is not fired for several weeks.

When it is fired, the bond is strong enough to separate
the neck from the case, leaving with the bullet.

I had this issue with new Starline brass in my 38-55.
Trying to pull unfired rounds was virtually impossible,
due to the bond that had occurred.. Dave.
Click to expand...

This sounds very plausible. Called "cold soldering" and is most common in ammo that has been in storage for awhile.

If you are stockpiling ammo - say your hunting ammo for future hunts, it is best to leave the bullets seated long and then give them a final seating before the hunt. This would break any bonding.
 
Eagleye said:
Are you cleaning your brass with SS pins and a solution?
If so, the insides of those necks may be super clean.

Subsequently, seating a copper alloy bullet in the very
clean brass can result in a metallurgical bond between
the bullet and the case neck, particularly if the loaded
round is not fired for several weeks.

... Dave.
Click to expand...

Just to add a couple of cents, I ultra sonic clean and the super clean necks have caused me issues.

Erratic grip/seating issues that seemed to show up on the chrony and paper, and a custom honed stem by Forster, until I figured out in my situation that a proper application of dry neck lube film all but solved the issue.

FWIW.

Regards
Ronr
 
Maybe I've never ran into this, because I do use dry neck lube for sizing , on everything done it since Day 1, came with a Bonanza accessories kit when I first started reloading. It makes a big difference in effort when resizing. Think maybe I've had one or two cracked necks somewhere in history in 40 yrs. I have various brands of brass that have been loaded 5+ times, some up to 12 w/o annealing. Using old FLS and neck dies, M-dies and bushing bump dies and expander mandrels nowadays, with dry neck lube, no issues with necks.
 
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