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It was my understanding that it was oil from your fingers that ruined them, I have personally touched many a primer without a failure.
Once I left a box of 45acp 230lrn reloads in my car for several days during the summer (AZ). It gets about 140 degrees in a car with the windows up. The bullet lube migrated into the powder, and about half were turned into duds and some fired but barely pushed the bullet out of the barrel.
Waterdog
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