No manufacturer is going to warranty for defective ammo, no matter who made it. If you shoot factory ammo and it blows up the weapon, the ammo maker is liable. If you loaded the ammo, then of course you should be considered at fault.

I've got a rifle with a lifetime warranty. It also came with suggested load data, from the manufacturer. I've discussed load data with a few of the manufacturers. Most will merely disclaim the warranty for problems caused by defective or improper ammunition. Armalite is extremely particular in this regard.
All pressure related failures are not catastrophic, and they are not all ammunition related, even catastrophic failures.