Looking for load data for 30-378, Berger 230 OTM & H50BMG

Discussion in 'Reloading' started by TX mountain hunter, Oct 28, 2012.

  1. TX mountain hunter

    TX mountain hunter Well-Known Member

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    Dec 17, 2010
    I'm looking to load up my 30-378 using the Berger 230 grain OTMs and H50BMG. I've been unable to find data on Berger's or Hodgdon's websites for this combination. Can someone please help me with some starting data or accuracy node / max load data (and the setup it was for) if you have it?

    I currently have both CCI 250 & Fed # 215 Large Magnum primers (side question - are these what everyone refers to as the Fed 215 or 215M's?).

    I have a fairly new 8lb jug of H50BMG that I would prefer to use, but I also have a little H1000 to try out if there is reason to believe it will perform significantly better.

    Rifle Specs:
    1-10" twist, 26", ~3.845" max oal (mag restriction), chambered in factory 30-378 WBY.
     
  2. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    With the 300 rum and 225 hornady we were running up to 102 grains on rl50 with a 225 hornady. I'd start at 100 grain with h50bmg and work to full pressure if you can't find data and you should land in the 3100 to 3150 fps range + -. It looks like the 30-378 is around 15% heavier charges than the 300 rum in the data I've perused. I've done similar work with I 5010 and wc872 in my 300 rum. The 50 bmg powders aren't that far apart speed wise unless they were meant for alternate loadings, so if you back off 10-15% and work in slowly you will get there.
    The 215 m are the match variant of the 215.
    I'd guess you will do better with h50bmg than h1000, but you could toss both loads together and let them fight it out.
     

  3. TX mountain hunter

    TX mountain hunter Well-Known Member

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    Dec 17, 2010
    Good call on starting from 100 gr. I just got an email back from berger containing this data. Thanks also for the reply on the 215M's, that sounds familiar now.

    Bullet / Powder / Start Load / Approximate Start Velocity / Max Load / Approximate Max Velocity / Fill Ratio
    230 Grain / H 50BMG / 101.0 / 2725 / 106.5 / 2891 / 97%

    Any tips on whether or not to start with the CCI 250s or the Fed. 215 primers?
     
  4. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    I've been doing mil-surp. powder loading for a while. If I have correlating data to find a start, I'll work from 10-15% down into a load. I have no patience for going for it without a workup though.
    Both mag primers would probably work, but if I'm serious about a load in a bigger round I'll go fed 215. I save the wlrm and cci 250 for the mid cals.. Even then I'll use the 215 rather often.