I just ordered and received a case (500) of these from GT, and I'm seeing the same inconsistency in seating depth across a random sample pulled from multiple boxes in the case. Tonight, I'll measure OAL and take pictures but what I'm seeing looks like the image pictured earlier in this thread.
I've called GT Distributors and they were less than helpful, and basically said they don't take returns on ammo, and to call Winchester. Finally, I coaxed a "We'll check into it and call you back" out of the customer service rep.
If anyone gets in touch with Winchester, please share the contact info for whoever you talk to, please.