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Old 05-18-2018, 08:30 AM   #11
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William Davis
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I have had several pierced primers with RST 10 G shells, all Cheddites. Never with Win 209s

However pierced is something I see in single shot rifles. I shoot a CPA Stevens 44 1/2 reproduction. The hammer strike is externaly adjustable, switch barrel with 3 different calibers and I run two with large pistol primers one with large rifle primers. Complicated.

Thing I have learned is there is a relationship between pressure, hammer strike, firing pin shape, protrusion and the primer itself. Any one going too far they will pierce. CPA added a gas escape hole in the breech block, original Stevens did not have them, to route escaping gas. Same idea as the Parker photo Dean posted.

If they are piercing something should be changed, I would have a good Parker man check all the gun possable causes, since Win 209 primers don’t have a soft reputation. Escaping gas through the pin hole can cause a lot of problems.

Having said all that manufacturers will always look for ways to cheapen products primers no exception.

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Old 05-18-2018, 08:32 AM   #12
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Guys with Browning O/U's complain Cheddites will pierce and cause burnt firing pins and thay have to replace them. Boy, that would have to be a lot of gas to blow off a piece of stock. Maybe the stock had a small crack you hadn't noticed.
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Old 05-18-2018, 08:49 AM   #13
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There are several things that can occur during the manufacture of a primer that could lead to pierced primers. The most likely culprit, if it is in fact a fault of the primers, would be an improper temper of the strip stock used to produce primer cups. I can't imagine Olin would reduce the thickness of their strip stock to save fractions of pennies.

Many things can go wrong if the manufacture of primer components are not closely controlled with an eye on consistency.
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Old 05-18-2018, 11:26 AM   #14
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I have had problems with Cheddites piercing on guns that hit the firing g pin on an angle.
On a gun like my 1100 or Model 12 that hit straight on, no problems.
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Old 05-18-2018, 01:08 PM   #15
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Effect gas blowing back through the hole depends a lot on the fit, hole to pin. Standard modification old Single Shot rifles is to bush the pin hole and fit up a new pin close. Effect of a blown primer with smokeless powder in Trapdoors, Rolling Blocks, other falling block actions with large firing pins and loose fit in the block can be dramatic.

Shotguns operating at lower pressure probably less, but loose fits lots of gas can cause real problems.

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