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An interesting choice and a good one.My 264 has "standard" length throat,so my loads might be too hot for your chambering.But after much testing these powders are worth trying:IMR7828 ,nice and lineral;AA MagPro ,it works;and my favourite Ramshot Magnum. Retumbo was inaccurate for me.Avoid: H-1000 ,too spikey ;and R-25 ,much too temperature sensistive.John Barness wrote about the 264 in Handloader.
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