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Location: north Idaho, USA
Joined: 08/13/2007
Posts: 131
Primer selection for 300 win mag

Is there any difference between these four primers....
Federal 215, CCI 250, Remington 91/2 m and Winchester WLRM.
Nosler's 6th edition seems to treat them as universal. Their load work up calls out the Federal 215. Will a different primer in this category produce a different result.
Thanks for the advice.
Rogie

Don Fischer's picture
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Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3200
Primer selection for 300 win mag

I'd try all of them with the same loads to see which gives better accuracy. Primers do make a difference there. All are magnum primers and for big cases of powder, especially ball powder, they are usually recommended.

bitmasher's picture
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Location: Colorado
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Primer selection for 300 win mag

In my experience there is not a lot of difference between CCI and Federal.

Match primers tend to be more consistent from lot to lot and within a lot. So you might notice a difference between the match versions of CCI/Federal and the none match versions you listed.

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Location: Melvina, Wi.
Joined: 02/18/2007
Posts: 262
Primer selection for 300 win mag

I just got some Remington primers in a trade out with supplier--one box of 1,000 is labeled Remington 9 1/2 M Magnum Primers. In the past I have always used CCI mag primers and am not familar with the M designation, as opposed to Magnum Large Rifle--any info appreciated.

Don Fischer's picture
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Location: Antelope, Ore
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Primer selection for 300 win mag

Remingtons designation for large rifle primers is 9 1/2. The magnum version simply adds an M.

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Location: Melvina, Wi.
Joined: 02/18/2007
Posts: 262
Primer selection for 300 win mag

Thanks Don--That is what i thought but other manufacturers do not add any letters to their primer #'s or names.

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Location: Scottsdale, Arizona
Joined: 09/05/2007
Posts: 98
Primer selection for 300 win mag

You will probably see no difference from brand to brand. There is a difference in standard and Magnum, however. For the 300 Win Mag always use the Magnum primers whatever brand. If the temperature is going to be lower than 32 Degrees F., I believe you should be using them on hunting loads no mater what size of large caliber rifle ammo you are loading. I make it a habit to work up all of my large caliber hunting loads with the Magnum primers.

SoCoKHntr's picture
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Location: Pueblo Colorado
Joined: 12/18/2006
Posts: 1801
Primer selection for 300 win mag

As someone else said accuracy is the reason for trying different primers as with all other components.

For example I recently made eighteen reloads of an identical load expect for the primer. For nine rounds I used a Rem 9 1/2 pushing a 55gr HPBT with 34 grains of Varget. I made another nine with the only difference being that I used a CCI large rifle primer in the those.

With the Rem I would get two almost touching and one flyer each time resulting in about an 1 1/2 inch group for a three shot group.

With the CCI it went under 1/2 inch each time. My 22-250 liked the CCI better with all other things being equal.

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Primer selection for 300 win mag

SocoKHntr wrote:
" With the Rem I would get two almost touching and one flyer each time resulting in about an 1 1/2 inch group for a three shot "
That doesn't sound like a primer problem to me, sounds more like a barrel getting a bit over temp, if the third shot is the "flyer"
Good to see ya up in Reloading ,rumor has it that they were picking on you down in Political Section, glad you escaped

SoCoKHntr's picture
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Location: Pueblo Colorado
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Primer selection for 300 win mag
Hammer1 wrote:
SocoKHntr wrote:
" With the Rem I would get two almost touching and one flyer each time resulting in about an 1 1/2 inch group for a three shot "
That doesn't sound like a primer problem to me, sounds more like a barrel getting a bit over temp, if the third shot is the "flyer"
Good to see ya up in Reloading ,rumor has it that they were picking on you down in Political Section, glad you escaped

Hey, thanks Hammer, I think it was the primer as all other factors including cool down time for barrel betweens shots was the same. Think

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Joined: 12/03/2005
Posts: 1691
Primer selection for 300 win mag

I haven't changed primers, or bought any, in probably ten years, BUT, if the primers are all from the same lot, stored together, etc....powder deterioration..?... I just don't know
Maybe some of the old guys will know Big smile Big smile Big smile

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