338-378 load data

Discussion in 'Reloading' started by 338-378 lineman, Feb 2, 2011.

  1. 338-378 lineman

    338-378 lineman Member

    Jun 15, 2010
    Does anyone have any load data for 250gr sierra game kings.
  2. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

    Mar 12, 2002
    122-124 grains of H-870 was my best load when I shot that bullet years ago when it first came out. it shot right at 3300 fps out of a 28" barrel.
  3. idaho elk hunter

    idaho elk hunter Well-Known Member

    May 7, 2013
    Rl 25 with 112 gr and a win MAG primer loaded out to 3.86 coal will run HARD. I have foung the Sierra/ Hornady/ Berger etc do not respond well to the Weatherby Freebore. You might try the Thicker Accubond, Barnes 265 LRX, Hornady GMX , Cutting edge, etc. Of your shooting a factory barrel these will ALWAYS shoot better in the Weatherby freebored rifles. Step up to the 300 gr Accubond or the 280gr LRX barnes vita vouri n 570 or RL33 really does the job. You should push the 250 gr loads about 3250 and the 300 gr loads 3100. I specialize in building Weatherby only rifles and loads. This info is SOME:) of the tricks to a Weatherby out performing any other cartridge.