Look, have the barrel magnafluxed at the local autoshop if you have any questions about its integrity. Then keep the blackpowder charge low. No maximum load.
If nothing else, you can always sell the barrels. Some blackpowder gun builders will buy them and use them as a basis for building a new gun.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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