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Rifles, Reloading, Optics, Equipment
Reloading
High Pressure Signs?
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<blockquote data-quote="Akhunting" data-source="post: 729764" data-attributes="member: 59197"><p>I have been reloading for another of years but usually worked on pistols or a load that worked in a rifle with adequate accuracy and never really refined loads for maximum accuracy. </p><p></p><p>Lately I have been working on my .220 Swift and have worked up a few nice loads. I am wondering about pressure signs in my loads though and how they present themselves. The primer is what I was always told to look at first but I am coming to the conclusion that it is not a very reliable indicator. In a number of my firearms I have noticed, using factory ammo, signs that I would consider high pressure by looking at the primers. Flattening seems to be the most common, there have been some factory loads I shot that really flattened the primer. </p><p></p><p>Recently, I have been using various powders and and bullets with the same brass and primers. On my most recent loads the pressure signs were completely different from past loads though; as I approached maximum published loads with H380 the primers began flattening with no firing pin cratering. The other load I had been working with was IMR4831 and as I approached max the primers only slightly flattened but cratering became much more pronounced. </p><p></p><p>These two powders are of similar burn rate, the 4831 being a bit slower. Does this explain the difference in pressure signs?</p><p></p><p>I have heard of other methods of looking at pressure signs, what are others doing with good results?</p></blockquote><p></p>
[QUOTE="Akhunting, post: 729764, member: 59197"] I have been reloading for another of years but usually worked on pistols or a load that worked in a rifle with adequate accuracy and never really refined loads for maximum accuracy. Lately I have been working on my .220 Swift and have worked up a few nice loads. I am wondering about pressure signs in my loads though and how they present themselves. The primer is what I was always told to look at first but I am coming to the conclusion that it is not a very reliable indicator. In a number of my firearms I have noticed, using factory ammo, signs that I would consider high pressure by looking at the primers. Flattening seems to be the most common, there have been some factory loads I shot that really flattened the primer. Recently, I have been using various powders and and bullets with the same brass and primers. On my most recent loads the pressure signs were completely different from past loads though; as I approached maximum published loads with H380 the primers began flattening with no firing pin cratering. The other load I had been working with was IMR4831 and as I approached max the primers only slightly flattened but cratering became much more pronounced. These two powders are of similar burn rate, the 4831 being a bit slower. Does this explain the difference in pressure signs? I have heard of other methods of looking at pressure signs, what are others doing with good results? [/QUOTE]
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High Pressure Signs?
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