Opinions RE primer choice for the 300 Win Mag

Discussion in 'Reloading' started by Michael Eichele, May 10, 2014.

  1. Michael Eichele

    Michael Eichele Well-Known Member

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    Looking for what 300 win shooters have had the best results with which primers. So far my most accurate loads have been with 210 match but my ES is a bit high at times. I've also tried BR2s but they seemed weak.

    215 match mag do fair but the accuracy isn't as good.

    Any ideas or thoughts/experiences are welcome.

    M
     
  2. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    I'm using 215 primers in my 300win. I want enough ignition for any temp. so I stay away from standard primers in my larger calibers.
     

  3. brentc

    brentc Well-Known Member

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    I get my best accuracy and ES results with cci 250s. Others I've tried are Fed 210m, 215m, 215, and cci 200.
     
  4. Kennibear

    Kennibear Well-Known Member

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    We use Fed #215 in 300 WinMag but for what it's worth I had one load in 30/06 tighten up when I went to Rem 9 1/2M from Fed #215's. Never saw improvement with CCI 250's. I don't think they are hot enough. I cannot speak to WW primer changes as I have only used LR standard WW and they did nothing special.

    KB
     
  5. Kennibear

    Kennibear Well-Known Member

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    Please post your load as I found powder type has a preference sometimes.

    KB
     
  6. Broz

    Broz Well-Known Member

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    My go to primer for the 300 win with H-1000 is FED GM 215 M's

    Jeff
     
  7. phorwath

    phorwath Well-Known Member

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    I don't shoot near as much as you or Broz. But I collected quite a bit of data during load development with this combination of components: Berger 210 VLDs, IMR 7828, Lapua cases, trying both GM210M and GM215M primers. All results (Temp, powder, primer, MV, ES, and group sizes) were recorded in Excel spreadsheet form.

    I got slightly lower ES and a slightly better accuracy from my rifle with the 215s. So I settled on GM215M.