It Is not in the nature of Corporations to admit failure. I do recommend reading the book
The Corporation: The Pathological Pursuit of Profit and Power
The author makes the case that you can model the personality of a Corporation as a human psychopath. Human psychopaths are grandiose, self centered, lie without guilt or shame, have no guilt or shame, and never admit fault. The problems they create are always someone else’s fault. The thing is, since psychopaths think they are the best that has ever been, or every will be, failure chips away at that self delusion of awesome perfectness.
It is a good model, and something else to know, you can only have a master slave relationship with a psychopath. If you are negotiating, they know you are weak.
Winchester wants you as a repeat customers, so you might get a free box of ammunition to replace the bad, but understand, they won’t admit fault. And, don’t try to get them to admit fault. Play the part of a fanatical, ideologically loyal customer who can’t believe that this bad ammunition somehow made it out the door of their perfect factory.