338/300 RUM loads?

Discussion in 'Reloading' started by crittergitter, Sep 18, 2007.

  1. crittergitter

    crittergitter Well-Known Member

    Apr 5, 2007
    Working up a load for a 34" bbl 338/ 300 RUM with 300 grain SMK's. I am at 88 grains of Retumbo and .19 moa groups...about 2700 fps. I don't know how far I can go with Retumbo without dangerous pressures. Any suggestions?

    What can I expect from US869?

    Any other load suggestions?
  2. davewilson

    davewilson Well-Known Member

    Feb 19, 2004
    you probably have a few grains to go. just load some up one grain at a time till you get an extractor mark. then consider 2 less grains about max. Retumbo will give you more velocity but most don't get as good of accuracy at long range because your ES will probably be higher. H1000 will produce less velocity but usually the best accuracy at long range.