Reloading once too may times

[John 743]

Gonra's gonna have a fun time with this one. That lacquer is a bit more important than "feeding"

6.5 gr. blue dot 40gr Vmax Zmax Hornady bullet. Didn't notice during firing and picked up the brass and then I noticed it. Short day.



I double weigh each load so it's still +/- 0.1 grains. Near as I can figure it was caused by something like this: (scraped by my thompson contender) I am on my 4th time round with my reloads.



I

[Rapier1772]

With FsN,the lacquer is more for extraction than feeding. For T/C though, I have no idea.

My cases usually split at the neck

4 reloads is pretty good with that charge though, guess it felt the need to retire to the recycling bin :laugh:

[John 743]

the split case came out of my 57 but the scratches are caused by the tc barrel.

[GONRA]

GONRA sez we always have to face the tiny possibility
of cartridge cases material defects or weaknesses when we’re blasting away.
(Certainly the TC Contender scratch can’t help!!!)

Even fresh Major Factory brass cartridge case ammo some times has body splits – first shot.
To me the fact that some of ya’ll reload the 5.7x28 FN cartridge multiple times
and do NOT HAVE MANY MORE BODY SPLITS THAN REPORTED is Truly Amazing.

5.7x28 FN cases fired from FN’s modified retarded blowback self loading firearms
suffer an unusually high “axial stress” whilst extracting from the chamber.
Fired cases seem to have a measurable “body swell”.
These combined stresses can really do a number
on the poor olde cartridge case brass material!

Considering the “combined material stress beating” these cartridges take,
am a little surprised we can get ONE reload out of them!

Any Material Science guys out here who can figgerout this stuff?

Some things are always Great Mystery’s – like Body Splits in multiple reloaded cartridge cases

[VeTTeMaNC486]

I've had a case split like that on the first reload. I do not remember the charge weight but it was a decently hefty charge of blue dot behind a 55gr fmj. It only happened once so I didnt think twice about it. I have had a few .44mag factory winchester brass do that before.

[Fotis]

I have never went over 6 gr Blue dot with 40 gr v maxes

[Camba]

I had two neck plits in my reloaded 5.7x28 for the TC. It happened after 8 or 9 times using them. I did get about 6 more neck split during bullet sitting. Perhaps they became brittle after so many reloads. I thought about annealing the cases but that messes up with the coating.
All my reloads are for the TC rifle and at the prices for the 5/7FN pistols, I probably never own one.

Camba