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#8015180 - 08/26/13 magnum vs standard primers for 300 win mag
Snake River Marksman Offline
Campfire Ranger

Registered: 03/05/07
Posts: 1786
Loc: Etna, Wyoming
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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#8015207 - 08/26/13 Re: magnum vs standard primers for 300 win mag [Re: Snake River Marksman]
n8dawg6 Offline
Campfire Ranger

Registered: 01/20/07
Posts: 2209
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.


Edited by n8dawg6 (08/26/13)
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#8015218 - 08/26/13 Re: magnum vs standard primers for 300 win mag [Re: n8dawg6]
jorgeI Online   content
Campfire Kahuna

Registered: 06/20/03
Posts: 24054
Loc: Orange Park, Florida
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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#8015225 - 08/26/13 Re: magnum vs standard primers for 300 win mag [Re: jorgeI]
SuperCub Offline
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Registered: 06/27/02
Posts: 5426
Loc: NB / Canada
Are magnum primers generally used for large +80gr loads or slow powders?
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#8015298 - 08/26/13 Re: magnum vs standard primers for 300 win mag [Re: SuperCub]
Huntz Online   content
Campfire Tracker

Registered: 10/29/07
Posts: 6041
Loc: N.E.Wisconsin
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


Edited by Huntz (08/26/13)
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#8015373 - 08/26/13 Re: magnum vs standard primers for 300 win mag [Re: Huntz]
gmsemel Offline
Campfire Tracker

Registered: 01/28/01
Posts: 5643
Loc: East Haddam, CT
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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#8016652 - 08/26/13 Re: magnum vs standard primers for 300 win mag [Re: Snake River Marksman]
boatanchor Offline
Campfire Regular

Registered: 11/11/06
Posts: 1401
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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#8016677 - 08/26/13 Re: magnum vs standard primers for 300 win mag [Re: boatanchor]
Seafire Offline
Campfire Kahuna

Registered: 04/21/04
Posts: 21113
Loc: Southern Oregon USA
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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#8016818 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: Seafire]
boatanchor Offline
Campfire Regular

Registered: 11/11/06
Posts: 1401
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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#8017191 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: boatanchor]
rufous Offline
Campfire Regular

Registered: 07/13/01
Posts: 1293
Loc: Dixie, WA
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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#8017208 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: Snake River Marksman]
calikooknic Online   content
Campfire Tracker

Registered: 09/04/12
Posts: 6675
Loc: San Joaquin Valley, Kalifornis...
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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#8017744 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: calikooknic]
BobinNH Online   content
Campfire Oracle

Registered: 01/28/07
Posts: 30547
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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#8017818 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: BobinNH]
jorgeI Online   content
Campfire Kahuna

Registered: 06/20/03
Posts: 24054
Loc: Orange Park, Florida
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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Originally Posted By JoeBob
I don't need a genealogy lesson from a Cuban mustefino who caught a ride over on a leaky 1957 Chevy that used milk jugs for floats.
Of course, I do have some lettuce that needs to be picked if you are interested.

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#8017975 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: jorgeI]
BobinNH Online   content
Campfire Oracle

Registered: 01/28/07
Posts: 30547
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.
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#8017992 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: jorgeI]
Snake River Marksman Offline
Campfire Ranger

Registered: 03/05/07
Posts: 1786
Loc: Etna, Wyoming
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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#8017999 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: BobinNH]
jorgeI Online   content
Campfire Kahuna

Registered: 06/20/03
Posts: 24054
Loc: Orange Park, Florida
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 JoeBob
I don't need a genealogy lesson from a Cuban mustefino who caught a ride over on a leaky 1957 Chevy that used milk jugs for floats.
Of course, I do have some lettuce that needs to be picked if you are interested.

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#8018022 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: BobinNH]
jwp475 Offline
Campfire Kahuna

Registered: 04/25/05
Posts: 19405
Loc: USA
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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#8018479 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: jorgeI]
BobinNH Online   content
Campfire Oracle

Registered: 01/28/07
Posts: 30547
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
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#8018569 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: BobinNH]
gemby58 Online   content
Campfire Guide

Registered: 11/05/05
Posts: 3211
Loc: Central, PA
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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#8018679 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: gemby58]
Snake River Marksman Offline
Campfire Ranger

Registered: 03/05/07
Posts: 1786
Loc: Etna, Wyoming
"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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#8018709 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: gemby58]
BobinNH Online   content
Campfire Oracle

Registered: 01/28/07
Posts: 30547
Originally Posted By: gemby58
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


Well gemby that's a new one on me as well; maybe it's true but, shooting below 20 degrees F is a pretty routine matter for me since I shoot more in winter than summer, and about every year I will see below those temps in the east or west during hunting seasons..... my biggest Canadian whitetail was killed at -25 F after I had been out in that stuff all day.

I like to set rifles up to work under any conceivable condition but I am sorta anal anyway. smile
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#8018752 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: BobinNH]
gemby58 Online   content
Campfire Guide

Registered: 11/05/05
Posts: 3211
Loc: Central, PA
It gets -20 below where you live, I'll stay in pa, good luck with that. I have 37 magnum rifles and not one magnum primer in the house. You relaying what I was told, don't kill the messenger

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#8018794 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: BobinNH]
calikooknic Online   content
Campfire Tracker

Registered: 09/04/12
Posts: 6675
Loc: San Joaquin Valley, Kalifornis...
I would take a guess that standard vs mag is not as critical or varied in cases with larger bore vs capacity cases. The more overbore or what ever term you prefer also suits faster powders compared to the large capacity/smaller bore situations. Just a thought?
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#8018856 - 08/27/13 Re: magnum vs standard primers for 300 win mag [Re: BobinNH]
jwall Online   content
Campfire Tracker

Registered: 09/06/10
Posts: 5053
Loc: Southern Arkansas
I've read all of this thread so far..

I haven't posted BECAUSE I haven't bought primers in a long time. ALL my testing is 80's vintage..so take that into consideration.

Originally Posted By: BobinNH


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.


SAME HERE except I've not tried the 215s.

Bob - the last primer testing I did was AFTER WW brought out their LRMP. I tested/compared the older WW 8 1/2-120 against their WW LRMP******** there was NO DIFFERRENCE over the graph OR on paper. I have BOTH and use 'em.


NOW I don't have any idea what the NEWER primes are doing. I've noticed that WW primers are brass colored..ALL mine are silver.



Back in the 'olden' days of 70-80s I read more than once to use Mag primers with 'ball' powders OR charges 'over 60 grs.'
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