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I suggest trying the tubb F F on an old barrel first, and see how it goes. There is some throat erosion from doing firelapping. Which is not an issue with a .22 hornet, or maybe a 30-06, but something like a 7mm ultra mag, i think you would be taking a bit of life from that barrel. It`s important to push the lead slug through the barrel first to see if there is a problem, and go from there.
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