I have some ammo from different manufactures. I buy from known company's and suppliers. Went to test fire a couple of AR builds, the kids xmas presents. Hand a bunch of failure to fires and a couple hand fires. thought it was the guns until I changed ammo. Seem to have hard primes on the lot I bought. Just a heads up i am now test firing 20 or so rounds from what ever I buy so in a SHTF situation I know it will work. I was luck that this was only a 500 round lot.