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Rifles, Reloading, Optics, Equipment
Reloading
Midway and primer "alert" (whine...)
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<blockquote data-quote="Bart B" data-source="post: 343627" data-attributes="member: 5302"><p>I've ran two tests with new (2 months old) and old (4 years old) primers at 600 yards. Two groups were shot side by side alternating between each one with new then old primers. New ones produced a 2/3 MOA twenty-shot group at 600, old ones just over 1 MOA. All were kept in sealed military ammo cans. Others have reported about the same performance between new and old primers. There's a greater difference at 1000 yards.</p><p></p><p>When the Russian primers came out and PMC sold them, they would last forever as their chemistry didn't degrade over time. Wolf took over those primers and they're still the same primer. Very popular with competitors.</p><p></p><p>Old, weakened firing pin springs cause the same problem with primers; inconsistant performance. Primers need to be smacked hard and some rifles benefit from springs stronger than factory specs. I've got the same groups size differences using a 5 year old spring and a new one. Which is why I replace them every two years or whenever they are more than 10% less than their force rating.</p></blockquote><p></p>
[QUOTE="Bart B, post: 343627, member: 5302"] I've ran two tests with new (2 months old) and old (4 years old) primers at 600 yards. Two groups were shot side by side alternating between each one with new then old primers. New ones produced a 2/3 MOA twenty-shot group at 600, old ones just over 1 MOA. All were kept in sealed military ammo cans. Others have reported about the same performance between new and old primers. There's a greater difference at 1000 yards. When the Russian primers came out and PMC sold them, they would last forever as their chemistry didn't degrade over time. Wolf took over those primers and they're still the same primer. Very popular with competitors. Old, weakened firing pin springs cause the same problem with primers; inconsistant performance. Primers need to be smacked hard and some rifles benefit from springs stronger than factory specs. I've got the same groups size differences using a 5 year old spring and a new one. Which is why I replace them every two years or whenever they are more than 10% less than their force rating. [/QUOTE]
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Reloading
Midway and primer "alert" (whine...)
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