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300 WSM primer choice?

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Unread 09-20-2007, 08:26 PM
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Join Date: Jun 2007
Location: Chelan Co, Washington
Posts: 551
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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Unread 09-20-2007, 09:29 PM
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Join Date: Nov 2005
Location: Texas
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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.
The Truth Is Not Always Good For Business!!
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Unread 09-20-2007, 10:20 PM
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Join Date: Sep 2005
Location: Colorado
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I've used CCI magnum large rifle primers for my WSM and they are working well.
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Unread 09-20-2007, 10:40 PM
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Join Date: Oct 2005
Posts: 172
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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Unread 09-21-2007, 10:47 AM
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Location: Wilmington NC
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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.

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Unread 09-21-2007, 02:48 PM
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Join Date: Mar 2007
Location: MN
Posts: 1,219
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.
I used to re-load but now I "hand-load".
-- Well, at least I try --
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Unread 09-22-2007, 08:58 AM
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Join Date: Oct 2004
Location: Atlanta, GA
Posts: 309
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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