If it's not a nickel steel barrel I wouldn't shoot any smokeless or jacketed bullets out of it at all.
You can do an amazing amount of damage to an old soft steel bore in short order with smokeless powder and jacketed bullets.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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