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  1. Barrel Wear and Tumbling Bullets

    Rifles and Rifle Cartridges
    I've been working up loads for a barrel I received as part of a trade, 1-8 twist 6mm AI. It shot very well with 87 grain bullets and almost as well with 70 grain bullets, but 20% of the 70 grain rounds tumbled. Switching to slower powders the tumble rate decreased to 10%. There was no in...