Ammo manufacturers can test each lot of powder and determine the load accordingly. Users aren't expected to be able to do that, which is what a canister powder is, as opposed to 'bulk' powder. Canister powder is to adhere to a close range of tolerances to avoid what happened to you.

I wonder of Hogdon would be willing to test a sample? However, it would be expensive just shipping a sample to them. Wonder if you can get them to spring for shipping? But it would really be good to know if the powder is out of spec. Maybe they owe you a gun.

Seeing how a gun was severaly damaged and lives endangered, I'd hope that they would cooperate.

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