05-17-2011, 03:13 AM
LR1955 Wrote:Combine this poorly designed bullet for the Grendel plus the potential that you had a primer which wasn't seated deeply enough and add the intertial firing pin of the AR series of weapons and you have the ingredients for an out of battery firing.
Definitely looks like out of battery based on the way the case split. I agree on the 120 AMAX, just problems with the Grendel exactly as you described.
One question: I have read that a firing pin strike out of battery is not technically possible with the AR design as the pin is not long enough unless fully in battery with the bolt fully back in the carrier. Which can't occur out of battery.
My suspicion is you are right about a high primer, about the most likely cause for an out of battery firing.