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300 WSM primer choice?

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  #1  
Unread 09-20-2007, 08:26 PM
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300 WSM primer choice?

Have run into a variety of different recommended primers for the .300 WSM in the published and on-line load data from different powder & bullet makers.

It's certainly not a huge case... What's working? Standard primers? Magnum primers?

The cartridge is new to me...

Thanks, Guy
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  •   #2  
    Unread 09-20-2007, 09:29 PM
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    I use the 215m's for mine. I also use them in my competition rifles so when loading for a sporter if it calls for a mag primer the 215m it is.
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      #3  
    Unread 09-20-2007, 10:20 PM
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    I've used CCI magnum large rifle primers for my WSM and they are working well.
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      #4  
    Unread 09-20-2007, 10:40 PM
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    Guy,
    I use large rifle primers, F210M, rather than mag primers in the 7wsm which is using a tad more powder than the 300 wsm. The SD is lower and they light fine. If it was for use in freezing temps, I would change over to mag primers. I base this on testing WLR, WLRM, F215M, and F210M's.
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      #5  
    Unread 09-21-2007, 10:47 AM
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    Definitely non magnum, you will bet better accuracy 90% of the time.

    However, try both. No need for the magnum with MRP, H4350, H4831, which seem to be the go to powders for the WSMs.

    BH
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      #6  
    Unread 09-21-2007, 02:48 PM
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    used R19, Win 760, IMR 4350 H 380 and H4350. Used CCI 250 mag primers for all. I have to admit that Primer choice is not huge on my list of things to change. I choose a primer that is good for the cal and generally stick with it.
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      #7  
    Unread 09-22-2007, 08:58 AM
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    Old Rule

    was, for hunting, use a Mag for 4831 and slower powder or freezing temps. For accuracy Large rifle with the lowest S/D is optimum. Overbore
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