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optimal

  1. M

    Anybody have the OBT (Optimal Barrel Time) Matrix?

    I lost it when my old computer crashed. Looked for LTR David's website, as it was a source before. David's site seems to be offline now. Thanks, Shane
  2. D

    .223 optimal neck sizer bushing and powder?

    I got myself a Rock River varmint A4 and am going to start loading for it. Wondering what the best neck sizer bushing size is for lapua brass. Loading sierra blitzking bullets. Also wondering what everyone uses for powder. I was accidentely sent 8lbs of benchmark (no returns on powder) so I was...