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I'm putting a load together for my 300 winmag. I'm using h100v and 4831sc. Is a magnum primer required?


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not required, but optional. try it both ways.

edit: mag primer probably will make more of a difference with the hybrid powder, which is a temp-sensitive ball powder.

Last edited by n8dawg6; 08/26/13.

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A load engineer from Federal once told me if your powder charge is below 80 grains, try it first with the non-magnum primer and see what happens. I did and it worked, in my 300 Win, H&H, 338 and 375, I get more consistent accuracy with non-magnum primers. Years ago I bought a bunch of primed Fed brass in 338 and it came with 210s.


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Are magnum primers generally used for large +80gr loads or slow powders?

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I use magnum primers with ball powders in just about any size case.I experiment with different primers just to see what gives me my best accuracy.I have found that using a CCI mag primer with H4831 SC in a 270 with 140 gr Bergers gives me super accurate groups,top MV and low SD.But that is in one particular rifle.Trying different things is kind of what loonies do!!!! grin

Last edited by Huntz; 08/26/13.

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I use what ever the load call for the cartridge I am loading for. I will tell you that I been known to use the Federal 215 primer in all my ammo if I am going to be hunting in extreme cold. Sub Zero temps. In hot temps I make modifications to keep pressures with in reason. I am most concerned with reliable feeding extraction rather than the last 1/4 inch in Accuracy or that last 50 fps in velocity. Most of the time, you would not even notice the difference. I tend to do things more for piece of mind than anything else. Then again when you have 800 dollars rapped up with and elk tag for the late season you tend to split hairs. These days with shortages of ammo loaded or components to load ammo, using what ever you can find a buy makes sense. I like federal 210's and 215's but if all I can get is Remington's Winchesters or CCI's I would not loose any sleep over it.


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Must admit that I have never used H100v in a 300WM, IMO it is a bit fast burning unless you are shooting 150's. I shot 165's with H4831 for years with Fed 210's.
With 180's my powder of choice has always been RL22 with Fed215's.
In my current 300WM my favorite load is 210VLD's with H1000 and Fed 215's

Give us a bit more info on the bullet,primer, powder combo

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I light off 83 grains of H 1000 with a large rifle primer and it is more accurate than using a mag primer.. and haven't had an ignition issue down into the 20 degrees range...

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Originally Posted by Seafire
I light off 83 grains of H 1000 with a large rifle primer and it is more accurate than using a mag primer.. and haven't had an ignition issue down into the 20 degrees range...


Of what combo do you speak of ???

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I used with great success accuracy wise the F210 primer with the 180 Barnes TSX and RL22 in my 300 Win Mag. I am currently using Ramshot Magnum and the Barnes 200 LRX and the F215 primer.

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I would try them both if you have the luxury. I have a 270 Win that shoots great with mag primers and Magpro in heavier bullets. Couldn't get that rifle to shoot good groups with 150's in any factory or handloaded ammo. ( 1 1/2 - 3 inch). Mag primers made 5/8 - 1 inch groups normal. Same powder, RL22, and 200 grain Accubonds in a Tikka 30-06 shot 1/2 - 3/4 groups with standards? crazy They all like what they like.

Good luck.



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I have had magnum primers make a difference in velocity variation, and accuracy, when using RL22 in the 270 Winchester.

Messing with standard primers in magnum hulls is something I have never done since I figure the ammo makers know better than me what ignites large doses of slow burning powders in magnum hulls, so see no need to mess with success.




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Bob: Federal uses 210s I know for a fact in the 338 Win Mag. I can tell you the 210s work MUCH better in my 338 and 375 than magnum primers


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jorg I will take you word for it.... smile

Have never tried a standard primer in a magnum case so don't really know frown ...... except for the very old days when WW made just one primer, the old 8 1/2-120,which was pretty potent I guess. But since then I have used only WW mags and the Fed215.




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Boatanchor,
I pulled this data straight from Hodgdon's site:



180 GR. NOS E-TIP Hodgdon Hybrid 100V .308" 3.340" 58.9 2679 47,700 PSI 66.0 2941 60,800 PSI



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Bob: It works sir. The results in accuracy improvement were particularly dramatic in the 338, also the fact Federal Factory ammo is loaded with 210s supports this.


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Originally Posted by BobinNH
jorg I will take you word for it.... smile

Have never tried a standard primer in a magnum case so don't really know frown ...... except for the very old days when WW made just one primer, the old 8 1/2-120,which was pretty potent I guess. But since then I have used only WW mags and the Fed215.




Me too Bob I use 215's in all magnum cases that I load for and have no accuracy issues



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Originally Posted by jorgeI
Bob: It works sir. The results in accuracy improvement were particularly dramatic in the 338, also the fact Federal Factory ammo is loaded with 210s supports this.


jorg I didn't know that either... frown

I must not be paying attention. smile




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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I use standard 210 match primers with 85grs of H4831sc with no problems. Was told many years ago that magnum primers aren't needed till the temp goes below 20 degrees

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"Was told many years ago that magnum primers aren't needed till the temp goes below 20 degrees"

Around here, that'll be next week


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