Velocity Difference Between Standard and Magnum Pistol Primers?

[.455_Hunter]

Given the same load, how much difference in velocity do you see by switching between standard and magnum small pistol primers? The load in question would be a medium velocity 125 gr. .357 magnum. Thanks!

 

[rcmodel]

With medium velocity loads, probably not enough to notice, or matter.

But it would depend too on what powder you are using.

rc

 

[e2cTrainer]

http://www.thehighroad.org/showthread.php?t=417863

here's another thread on this site about that topic

 

[GRIZ22]

I saw an article comparing loads using magnum and standard primers with alomost no diffrence in velocity.

 

[Kernel]

So small a differential that the difference is lost in the standard deviation.

 

[Shadow 7D]

But isn't there a pressure difference between the primers, the magnums causing a quicker and higher pressure spike?

 

[CatsEye]

I have used CCI magnum and regular small pistol primers in 9mm and .40 loads with Titegroup and Power Pistol powders. Each of these loads were slightly reduced power. Over the chrono I found no difference at all. I won't speak to what you will find with your powder bullet combination though. Just relating what I have found with my loads.

 

[NCsmitty]

If you do a Google search using that question, you'll get a ton of data, just remember that the source is the internet and you need to pick and choose.



NCsmitty

 

[ranger335v]

"Velocity Difference Between Standard and Magnum Pistol Primers?"

Don't think there a calibrated answer to your question. That might be because guns differ, powders and charges differ and the primers themselves differ.

 

[BeerSleeper]

I suspect the difference between standard and magnum primers is not that the magnum lights off any hotter, but that the magnum primers light off with the same heat, but the magnums are harder, and tolerate greater pressure without blowing out.

Case in point: Remington recommends .40S&W loads not use their standard primer, but the magnum, as their magnum primer can withstand the typically high pressure of a .40S&W round.

Just a theory...

 

[The Bushmaster]

About 25 +/- fps. I get that big of a difference from standard CCI and Winchester standard primers.

 

[Ol` Joe]

Mag primers don`t necessarily have more brisance or "power", the difference over std primers is the heat and length of time the primer burns.
Some primers such as the WLR actually is a "hotter" primer then other std primers and even some mag types. The only way o know what a primer will do with the load in question is to crono it if you are worried about velocity.

Here`s a list ranking some primers by brisance. http://www.castingstuff.com/primer_testing_reference.htm

 

[NCsmitty]

Handloader Magazine published an article by A-Square where they tested different primers with a load in the 7MM ReMag.

160 grain Sierra boat-tail, 66.0 grains of Hodgdon H-4831 and Winchester cases.


Winchester WLRM (magnum)¬___ 3045 fps, 67,600 psi

Winchester WLR (standard) ____ 3024 fps, 64,400 psi

Federal 215 (magnum)________ 3036 fps, 61,400 psi

CCI 250 (magnum)___________ 3039 fps, 61,500 psi

Remington 9½ M (magnum)____ 3041 fps, 59,300 psi

CCI 200 (standard)___________ 3011 fps, 54,800 psi

The SAAMI max pressure for the 7MM ReMag is 64,000psi.

My rule of use is that I use standard primers with flake or extruded powder, and magnum primers with all ball powders. The key is the work up to an acceptable load using those parameters. I use CCI primers in all my rifle or pistol loads, and Winchester 209 in shotshells.



NCsmitty

 

[Clark]

In 9x19mm, the magnum primer acts like ~ 0.7 gr more powder in terms of pressure, but less than that in increased velocity.

 

[.455_Hunter]

Thanks for the info guys! I will post on what we find out.

 

[Balrog]

Winchester large pistol primers can be used for all loads, standard or magnum. It is easier just to use them than wonder about the differences between standard and magnum primers.