Are you able to take a picture of the rear end of one of these rounds that you tried to fire and post it on here? That should tell us if it's the gun or the ammo. If not try firing a few more. Then look at the rear of the case of the round and if there is a dent in the rim then it should have gone off and you can blame the ammo. If it is untouched then you probably have a broken firing pin which should be simple and inexpensive to fix.
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