Primer Flash Test

Smokeless

Smokeless

New member
http://www.6mmbr.com/PrimerPix.html



Very interesting and explains a lot as to why switching primers in a given load can change everything.

The torch like burn from CCI BR's, the 205m and the Russian primers looks very controlled and would be consistent more so than others. That matches my real world experience at least with the BR's, and 205m. Never shot the Russian variety.

Just sharing information for those who haven't seen this yet.
 
👍 Yes very interesting indeed!!! It got me looking at there web site. Looked up 223 data, and found out about the newer Winchester Small Rifle primers (the new bronze ones) are thinner than the old silver primers. Making them susceptible to misfires in a AR-15. Was not aware of this, thought I should pass this along.
 
I use WSR primers exclusively in the AR-15. My chronograph results with ball powders will tell you why.

I seat them below flush and have never had a problem. Me and about a million others.
 
After looking at the above pictures, anyone still worried about off center flash holes?
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Regards,
hm
 
I haven't looked at the link. But it sounds like a repeat of the same testing and photography that PS did over 30 years ago and the results haven't changed, except for the addition of some newer offerings.

- DAA
 
Originally Posted By: spotstalkshootHas there been any physical science correlation between primer flash form/temps and powder shape/burn rates?


Some, but it is scattered. Not scientific or comprehensive or consolidated in one place.

We do know that ball powders (most) benefit from a magnum primer. Cold weather conditions, generally benefit from a magnum primer. Some powders like MP-300 need compression and a mag primer to ignite even at all.

We know through application, that benchrest or match primers give more consistent ignition with extruded powder and reasonably temperate climate conditions, like competition matches.

Otherwise, I find it fascinating to take a known to you load that shoots well and is proven, and start switching only primer brand and type. The results are often remarkable.
 
Thanks for sharing this Smokeless. That’s a dramatic difference between a br4 and a Rem 7 1/2. Like you are suggesting it would be foolish to load the same for both. The 7 1/2 has lots of fans, could you explain the advantage of such a explosive flash to ignite the powder?
Edit: Sorry reread and you already answered that. Do you have a preference of these two primers for a.223 load with H4895 powder with 75 grain bullets.
 
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Originally Posted By: McGrawThanks for sharing this Smokeless. That’s a dramatic difference between a br4 and a Rem 7 1/2. Like you are suggesting it would be foolish to load the same for both. The 7 1/2 has lots of fans, could you explain the advantage of such a explosive flash to ignite the powder?
Edit: Sorry reread and you already answered that. Do you have a preference of these two primers for a.223 load with H4895 powder with 75 grain bullets.


For me with 4895 in a bolt gun in Texas, I would first try the Federal 205M.
 


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