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Rifles, Reloading, Optics, Equipment
Reloading
The first sign of excessive pressure is...
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<blockquote data-quote="Michael Eichele" data-source="post: 285104" data-attributes="member: 1007"><p>I am with AJ for the most part here.</p><p></p><p>I shoot most of my rounds over a chrony and ALL of my developmental loads over a chrony. The first thing I see before even lifting the bolt is the velocity reading. Most of the time I can predict whether or not the bolt will be sticky.</p><p></p><p>There are times however that I have pressure signs at lower than expected velocities and absolutly NO pressure signs at higher than expected velocities. It all depends on the primers, bullets, barrel quality, chamber demensions, twist, barrel length, how far off the lands you are AND whether or not all of these and more factors like the burn rate of the powder youre feeding it.</p><p></p><p>Pressure curves are also another complicated issue. You can still have HIGH pressure without pressure signs.</p><p></p><p>For me, I stop the ladder test as soon as I feel an abnormal bolt lift. It doesnt have to be sticky, just abnormal. Then I look for ejector marks, cratered primers and flattened primers. I pay no attention to the case head. Another BIG sign is loose primer pockets. Not neccesarily after many firings but if after one or 2 firings you dont have any resistance when seating a primer, it is time to back way the heck off. If I have even one sign, I stop and back off to the next charge weight below the last and I use that as a reference as my "max" load. Then I usually pick the most accurate load from the session below that one for "breathing room". In some cases, I will use a lower charge than max for most of my shooting and hunting but a max load where I know temps will be well under the mark when I developed the loads provided the accuracy is good at max. Most of the time it isnt.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 285104, member: 1007"] I am with AJ for the most part here. I shoot most of my rounds over a chrony and ALL of my developmental loads over a chrony. The first thing I see before even lifting the bolt is the velocity reading. Most of the time I can predict whether or not the bolt will be sticky. There are times however that I have pressure signs at lower than expected velocities and absolutly NO pressure signs at higher than expected velocities. It all depends on the primers, bullets, barrel quality, chamber demensions, twist, barrel length, how far off the lands you are AND whether or not all of these and more factors like the burn rate of the powder youre feeding it. Pressure curves are also another complicated issue. You can still have HIGH pressure without pressure signs. For me, I stop the ladder test as soon as I feel an abnormal bolt lift. It doesnt have to be sticky, just abnormal. Then I look for ejector marks, cratered primers and flattened primers. I pay no attention to the case head. Another BIG sign is loose primer pockets. Not neccesarily after many firings but if after one or 2 firings you dont have any resistance when seating a primer, it is time to back way the heck off. If I have even one sign, I stop and back off to the next charge weight below the last and I use that as a reference as my "max" load. Then I usually pick the most accurate load from the session below that one for "breathing room". In some cases, I will use a lower charge than max for most of my shooting and hunting but a max load where I know temps will be well under the mark when I developed the loads provided the accuracy is good at max. Most of the time it isnt. [/QUOTE]
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Reloading
The first sign of excessive pressure is...
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