Does heat affect primers that were stored.

[NotTwoShure]

I found a 1k of large pistol primers in my shed. I placed these in an older .30 cal. ammo can by mistake. Does this degrade the quality and/or “Fire-Ability”?

 

[bulletsnbrains]

Too many variables to be a solid accept/reject answer. Lets take a look from a Quality Assurance point of view. Using the AQL(Acceptable Quality Limit) calculator for a normal inspection. Take a random sample size of 32 pieces of the 1K primers. Test them, if you have 2 fails, accept the whole lot, if you have 3-7 fails, add 80 more samples, if you have 8 fails or more of the of the 32 piece sample, then reject. Of the 80 piece sample, If you have 7 or less, accept, if 8 or more reject.

Personally, I think the normal is too lax for such a precision part, the tightened AQL says 32 sample size equals 1 bad as acceptable and 4 reject whole lot. If 2 or 3 bad of the 32, then sample 80 more and if 3 or less bad, accept, and if 4 pcs bad reject lot.

 

[NotTwoShure]

Good info thanks, I have never had this issue and I started in 1974 with a Rock-Chuck.

 

[bulletsnbrains]

Love my Rock Chucker, I also attached the Piggyback II and run it progressively for .357, 9mm, 40S&W and 45Auto. I also keep my primers in sealed ammo cans, my bet the moisture is minimized and your primers will be fine.

 

[JohnD13]

I loaded a batch of .357's with small pistol primers that I re-discovered in the attic this summer. Based on where they were. I'd say they had been there since my son in law left 12 years ago. Heat/cold, they didn't have a misfire in the 6 to 700 rounds I loaded. But then I loaded 10 and tried them first. I think primers can tolerate a wide range of storage conditions, but most likely best to keep them in a stable climate.