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Slamfire's comments are worth noting.
It would be nice for me to see the primers from cases that slamfired. If they've got a normal, full depth dimple, your may have bump fired the rifle as it came out of recoil moving forward and your trigger finger stayed in place firing another round as the bolt closed on it. A proper, firm grip on the stock by your trigger hand's the best thing to do, then don't let your trigger finger forward to reset the hammer-sear engagement until the rifle's stopped moving from recoil.
If the sear-hammer engagement's been changed to below safe minimum engagement, that will sometimes cause slamfires from the shock of the bolt closing disengaging the hammer and letting it fall.
I don't see enough evidence of all stuff involved to say for sure what happened.
Anyone reloading fired cases from US made 30 caliber semiauto service rifles needs a case headspace guage so they can measure sized cases after sizing then compare them to fired ones. Sized case shoulders should be no more than .003" closer to the head than fired ones are. Otherwise, excessive stretching of the case about 1/4 inch forward from its head will cause the case to crack; or come completely off when fired and let a bunch of hot gas push metal parts into your head.
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