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Reboring an older Marlin

Discussion in 'Gunsmithing and Repairs' started by Balog, Nov 24, 2007.

  1. Balog

    Balog Participating Member

    Sep 22, 2003
    Directly below date registered
    Hello all,

    I'm considering buying a Marlin/Glenfield Model 30A. It seems to be a good price and I don't like cross bolt safeties. However, when I get a .30-30 I'd like to be able to rebore it to the Ackley Improved version. Doubtless I've just spent too much time in the Wildcat section of Cartridges of the World :) but I really love that chambering.

    So would that be a safe thing to do to an older rifle like this? Are there any issues I can expect to encounter? And can ya'll recommend a gunsmith in W. Wa to do the work?

  2. rcmodel

    rcmodel Member in memoriam

    Sep 17, 2007
    Eastern KS
    Yes you can rechamber it to 30-30 AI.
    But you won't gain much if anything in a lever-action.

    Ackley developed all of his "improved" cartridges way before there was any accurate pressure test methods employed by folks like him.

    Lever-guns are pretty much limited to 30-30 pressures, and the 30-30 brass tends to stretch and break if overloaded at all past factory load pressure in the springy actions.

    When the 30-30 AI is kept to reasonable pressures, you won't see enough differance in performance in a lever-action to matter.

    Put the 30-30 AI in a strong single-shot action that doesn't stretch brass, and it is a worthwhile conversion though.


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