LiveLife
Member
Tumbling loaded rounds was myth busted in Handloading & Reloading subforum by dry tumbling for 48 hours without powder breakdown, no change in OAL and supported by comparable range test/chrono data - https://www.thehighroad.org/index.php?threads/optimal-tumbling-time.910461/#post-12410844
I say 48 hours of tumbling is sufficient "torture test".
And primers are built military "tough" to withstand long days/weeks of rough offroad truck transport, hot/freezing/humid storage condition and even air dropped with crushing landing with barriers/moisture sealants to protect priming compound held by anvil tip - https://www.thehighroad.org/index.p...-and-discussions.778197/page-11#post-12417636
G&A article covered primer construction (cup, anvil, and priming compound called "pellet") and operation (When cup is hit, indent from firing pin/striker tip ignites priming compound against the anvil tip)
Interesting thing I noticed from the article was the reliability of primers.
"Based on the SAAMI-specified drop test, statistics will tell you that our [Winchester] primers are 99.9997 percent reliable ... A lead-styphnate primer is probably one of the oldest and most reliable devices on the planet."
Article noted that Black Hills Ammunition (Which uses Winchester primers) who test fires more than 100,000 rounds per year and sells tens of millions of rounds each year, their investigations over the years identified misfires were the result of a defective primer in only a very small number of cases.
"Primers are not perfect — nothing man-made is — but they are very reliable. Statistically, you might encounter a defective primer, if you shoot enough ... 99.9997 percent reliability ... means you might hit a misfire every 300,000 rounds.
Over the years, the average is one rejected primer in about every 250,000, but most of the flaws are minor defects or damage such as slightly out-of-round primers that would have no effect on reliability."
Article noted that Black Hills Ammunition (Which uses Winchester primers) who test fires more than 100,000 rounds per year and sells tens of millions of rounds each year, their investigations over the years identified misfires were the result of a defective primer in only a very small number of cases.
"Primers are not perfect — nothing man-made is — but they are very reliable. Statistically, you might encounter a defective primer, if you shoot enough ... 99.9997 percent reliability ... means you might hit a misfire every 300,000 rounds.
Over the years, the average is one rejected primer in about every 250,000, but most of the flaws are minor defects or damage such as slightly out-of-round primers that would have no effect on reliability."
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