Awhile back I posted a thread & a photo detailing a brand new Steyr AUG & a couple ruptured (Igman) cases.
Backstory: Sometime back around 2010 I picked up a 300-round Igman (IK) 5.56 M855 battle pack & tossed it into an ammo can, where it sat for a decade or so.
A couple years back I broke out the Igman, as it was the oldest pack in my 5.56 cache, with the intent of putting a couple hundred rounds through the new AUG. For sighting-in purposes, I loaded up some 10-rd Magpuls & after emptying the first one, I gathered up the spent brass & discovered that two of the first 10 cases had suffered like-ruptures. Back into the ammo can went the battle pack.
Aforementioned ruptured cases
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Well, I just spent, or should I say, I may have just
wasted the past couple hours ( 3 hours, to include fabrication of this rambling post

) attempting to salvage the M855 bullets & the powder ... i.e., I'm not sure I care to spend more time cleaning (acetone) the tar-like sealant off each bullet. That, and after having measured & recorded approx. every 10th-case's powder volume, I put all of the IK powder into a repurposed AA #7 container only to discover, while screwing the lid on, that there was a mildly acrid scent wafting out of the AA jar.
And forget about reusing the primers as, the over abundance of lacquer & the crimps notwithstanding, Igman 5.56 brass from the era was (still is?) notorious for sometimes off-centered &/or undersized (decap' pin-breaking) flash holes.
So now I am stuck with 290 worthless primed cases; 290 sealant-laden 62 gr. bullets & what, nearly 3/4 lbs. of powder that smells as though it is on its way out.
Some fun facts ...
~ For the 20 cartridges measured, C.O.A.L.s ranged from 2.239 to 2.545"
~ Powder volume in 20-some (5.56) cases measured ranged from 22.9 to 23.7 grs.
~ On one stripper two of the bullet tips were a different green. Those two were 223R-cased rounds containing an entirely different ball powder (28 grs.) & bullet crimp.
~ No doubt due to varying amounts of (effective) sealant, a good number of the bullets required considerable effort to remove them from their cases. How would this translate into ballistics - f.p.s., etc??
I closed my initial ruptured case post by saying that if Igman were the last ammunition & component manufacturer left on the earth, it would mark the end of my involvement in/with the shooting sports. That sentiment has not changed.
Misc. pics ...
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223 powder
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5.56 powder
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