Magnum or standard primers.

WildBillG

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Sep 5, 2018
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Alberta
Not sure if this has been asked before. What is the point at which some one should switch from standard to magnum primers. Does it go by charge weight,burn rate of the powder or temp most shooting will be done. Part of the reason I am asking is I am working up a load for my 280 Rem. I am using slow powders in the burn rate of Rl 25 to push the 168 VLD Hunting bullet. These powders max around 60 grains of powder give or take. I started load work up with the Fed 210M primers but I am wondering if the 215 might be a better choice. Seeking the help of the experts here.
 

Jed Cooper

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I heard once(source unsure)that anything over 60grs go with a mag primer, but I'm sure there are too many variables. If cold weather shooting or hunting you could try both primers after soaking the ammo in a fridge for a few hours, then chrono and punch some paper to see the results.

Hornady says std primer even with IMR7828, but YMMV
 
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cape cove

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Mar 17, 2016
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Canada
I use a mag primer when using ball powders regardless the case size or when the capacity gets to 55grs of powder or more. Not saying that at 55 I just switch, but if problems surface concerning ignition I will switch to a mag primer, and try several brands. JME
 

asd9055

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Nov 15, 2013
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Texas
If I am using loading manuals for guide, I use the recommendation. The vast majority of the times, Mag Calibers ask for Mag Primers.

I have two loads in 300 WBY that I use large rifle primers, but that is how those were developed. One accidentally by me and one intentionally by a gunsmith.

In the rare case that you would use cast bullets in a mag rifle, it is recommended not to use mag primers

In handguns, such as the 44 Rem Mag, when using light loads for fun, I use Large Pistol. For hunting, I use Large Pistol Magnum.
 

Hespco

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Mar 6, 2019
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W. Montana
Try both primers with the powder you wish to use. Watch your pressures. A chronograph really helps. The powder burning rate & air temp need to be considered. Hunting in extreme cold is where a mag primer helps ignite the powder. Generally some where around the burning rate of IMR 7828 is a point to start considering a mag primer. Start slow & work up.
 

Bill Cauley Jr

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Mar 1, 2016
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Tn
Not sure if this has been asked before. What is the point at which some one should switch from standard to magnum primers. Does it go by charge weight,burn rate of the powder or temp most shooting will be done. Part of the reason I am asking is I am working up a load for my 280 Rem. I am using slow powders in the burn rate of Rl 25 to push the 168 VLD Hunting bullet. These powders max around 60 grains of powder give or take. I started load work up with the Fed 210M primers but I am wondering if the 215 might be a better choice. Seeking the help of the experts here.
I don’t know where I’ve heard it but the rule of thumb is 60 grains and above of powder would require a magnum primer
 

MagnumManiac

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Feb 25, 2008
Messages
2,283
Funny thing...I let my groups tell me which primer the load likes.
I test both magnum and standard primers, no matter the charge weight.
Both my 17 Rem & 222 Rem use magnum primers with certain powders, such as 748.
My 25-06 uses magnum primers for all loads but 1...and so on and so forth.
My 338WM shoots the 215gr Sierra Gameking best with a BR4 primer.

Cheers.
 

Highlander44

Member
Joined
Jan 12, 2014
Messages
5
Location
Calgary Alberta
Not sure if this has been asked before. What is the point at which some one should switch from standard to magnum primers. Does it go by charge weight,burn rate of the powder or temp most shooting will be done. Part of the reason I am asking is I am working up a load for my 280 Rem. I am using slow powders in the burn rate of Rl 25 to push the 168 VLD Hunting bullet. These powders max around 60 grains of powder give or take. I started load work up with the Fed 210M primers but I am wondering if the 215 might be a better choice. Seeking the help of the experts here.
Hi,
I experimented a bit with Magnum primers with my .280 AI. Using H4831SC. The velocity increased slightly through the Magnetospeed, but the ES increased significantly, so I aborted testing. Rather have low ES & SD’s than a few extra FPS
 

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