Factory Ammo Over Pressure
- Thread starter alfsauve
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I purchased a 686 no dash when they first came on the market. It was a very early revolver, and I had primer flow with the thing. As it has been mentioned in the thread, that was a characteristics of the early production and it seems that yours went through some process. Also, because this is new to your revolver, your problem is most likely ammunition related.
Factory ammunition must fit into a large variation of weapons, and even though factory ammunition is pressure tested, if you manage to live a life where factory ammunition does not cause pressure problems in at least one of your weapons, you are a lucky individual. We must never deceive ourselves that the little devils inside the case are our friends or are totally under anyone's control. I have been reading about primers, from my box of old DoD technical reports, and learning that primers do things that I never heard of. A primer that blows too much burning mass into a powder charge will cause pressure spikes, for example. Take a look at the 82,000 psia round described on this web page: The Soapbox of Karl W. Kleimenhagen
Everything looks normal till the last two rounds. Primer cake is a mixture of components, from what I have been told, is mixed by hand, and therefore the homogeneity is not exactly perfect. Therefore it is very possible that the primer mix in some of those cups was a little hot, compared to the rest of the mix. But, this is hard to know. And the interaction of powder and primer is not exactly consistent and predictable, even though we want it to be. We are very fortunate that more blows do not occur with factory ammunition. I recall Hummer70 writing something on the predicted number of rounds per blowup with Army ammunition, my memory can't recall the numbers or the posts, but this post by Hummer70 is worth reading in that it shows ammunition and guns are not as perfect as we want
Things that can affect how well your ammunition performs.
Since I hardly shoot factory ammunition, most of my problems are with my handloads. My basic philosophy is to cut my loads until pressure problems go away. And to avoid shooting factory ammunition that create over pressure conditions in my weapons.
Factory ammunition must fit into a large variation of weapons, and even though factory ammunition is pressure tested, if you manage to live a life where factory ammunition does not cause pressure problems in at least one of your weapons, you are a lucky individual. We must never deceive ourselves that the little devils inside the case are our friends or are totally under anyone's control. I have been reading about primers, from my box of old DoD technical reports, and learning that primers do things that I never heard of. A primer that blows too much burning mass into a powder charge will cause pressure spikes, for example. Take a look at the 82,000 psia round described on this web page: The Soapbox of Karl W. Kleimenhagen
Everything looks normal till the last two rounds. Primer cake is a mixture of components, from what I have been told, is mixed by hand, and therefore the homogeneity is not exactly perfect. Therefore it is very possible that the primer mix in some of those cups was a little hot, compared to the rest of the mix. But, this is hard to know. And the interaction of powder and primer is not exactly consistent and predictable, even though we want it to be. We are very fortunate that more blows do not occur with factory ammunition. I recall Hummer70 writing something on the predicted number of rounds per blowup with Army ammunition, my memory can't recall the numbers or the posts, but this post by Hummer70 is worth reading in that it shows ammunition and guns are not as perfect as we want
Things that can affect how well your ammunition performs.
Since I hardly shoot factory ammunition, most of my problems are with my handloads. My basic philosophy is to cut my loads until pressure problems go away. And to avoid shooting factory ammunition that create over pressure conditions in my weapons.
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