OP,
I had a similar ammo issue in my SR15 last week, while at a 2 day Tiger Swan carbine class. I had a blown primer, and the debris lodged in the firing pin channel in the bolt, locking the bolt into battery like a mug
. I contacted Kevin B, who was most gracious and helpful (considering it was a Saturday AM), and managed to remedy the problem. The SR15 has 300 trouble free rounds thru it since last Sat, so I am once again 
The ammo in question for me was Royal Ordnance Radway Green SS109, 1989 manufacture.
SSG Jimmy Ide- KIA 28 Aug 10, Hyderabad, AFG
1SG Blue Rowe- KIA 26 May 09, Panjshir, AFG.
RIP Brothers
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