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Primers

 
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  #1  
Old 10-28-2008, 01:01 PM
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Primers

Does anyone know of any studies / experiments where the gun, bullet, powder and load were the same but different primers were used?
Was there a difference in velocity or accuracy?
It would also be interesting to see the difference in velocity and accuracy using the same scenario when temperature and altitude is a variable as well.
:confused:
Thanks
Ken
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  #2  
Old 10-28-2008, 03:38 PM
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Re: Primers

I don't know of but one printed study that was in a gun magazine a few years ago that I remember seeing but I have run my own. You will see some velocity change and accuracy with some primers is better than with others.
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  #3  
Old 10-28-2008, 07:34 PM
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Re: Primers

kstrick,
I did an informal test back in July of 2002 using my 7Mag Sendero and the Sierra 160gn GK. The powder of choice was RL19, with loads tested at 61, 62 and 63gn's. The OAL for all was 3.2645". I didn't take very good notes back then and don't have any special notes on the velocity other than it averaged 2751fps for all loads tried. I used Rem 9.5M and CCI BR2 primers. The 9.5M's all produced groups under 1MOA (.6-.9") and the CCI's were all over 1MOA (1.1-1.5"). Pretty uninformative as scientific data goes but I just did it to see if the primers make a difference. They do.
Check this out; (Primer Testing Reference). JohnnyK.
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  #4  
Old 10-28-2008, 09:46 PM
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Re: Primers

Thanks guys,
I am going to do some of my own informal testing myself.
I will post my results asap.
I will use a Rem .308, Ruger .300 WSM and a Rem .243
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  #5  
Old 10-29-2008, 12:36 PM
tlk tlk is offline
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Re: Primers

Why does it make a difference?

Loaded a large rifle primer on an empty case once upon a time and shot it to see the strength - flame came out out of the 20" barrel quite forcefully. If they all do this (assuming they all do), why would it make a bit of difference? Is it due to the force of the explosion, length of time of the primer explosion (more powder burning at once), or what?

In an odd kind of way, to me this is the same as asking how a difference in caps would change a shot from a percussion rifle. If it shoots flame, I assume we would be good to go.

I don't doubt it makes a difference, I just dont get it.

Last edited by tlk; 10-29-2008 at 12:40 PM.
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  #6  
Old 10-29-2008, 02:32 PM
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Re: Primers

I have done two posts on primers; suggest you use them as your testing starting point. Best wishes, Overbore
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  #7  
Old 11-01-2008, 08:07 PM
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Join Date: Nov 2005
Location: south central pa
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Re: Primers

kstrick,
i had the same question a while back,i found some info on the web. cant remember where though. anyway here it is.

cci200=mildest standard large rifle
wlr=hotest " " "
rem9 1/2=mildest magnum large rifle
wlrm=hotest " " "

the test below bullet/powder/charge/brass did not change, just primers

7rm/160spbt/66 h4831/win brass

winchester wlrm/3045fps/67600psi
winchester wlr/3024fps/64400psi
federal 215m/3036fps/61400fps
cci 250m/3039fps/61500psi
remington 9.5/3041fps/59300psi
cci 200/3011fps/54800psi

hope this helps,jason
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