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I sent my trigger group to Lucio to have a new tree put in and noticed when I got it back that the "web" on the lower hammer had been filed off (I know this is probably NOT the problem I just thought I would disclose it).

Anyway, I have some shells (Kent #5 shot 1 1/4 ounce 1350fps) that are getting the primer pierced on just about every one, however, it only happens on the bottom firing pin i.e. none of them pierce on the top firing pin.

I have tried changing firing pins and springs and I still have the same problem.

Also, it does NOT happen with any other shells (I have 2 other cases of Kent shells (#5 an #6 1 3/8 ounce 1475fps)and they don't pierce) my remington reloads, winchesters, etc...

Any ideas what the problem is?
 

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My KS-5 was doing the same thing when I received it back from a rebuild. It was happening to WW 209 primers. Had to file off the firing pin 1/16". Take off a very little amount every time and try it, until it does not do it anymore. Have not had a problem since. Jon
 

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That's the reason I quit using Kent shells..You can flatten the front of the pin a little.. you can polish it.. but not to a point.. just rounding it off a little.. That can help sometimes... but I gave up on Kent shells for the very reason you state.. They shot great.. but pierced primers can wreck havok inside a firearm..
 

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Suspect that Kent is using Cheddite hulls and primers. Cheddite are notorious for having pierced primer problems. sunburst yo switch ammo or primers.

Tom
 

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What is weird is the center of the indention in the primer has a tiny pin hole, yet the firing pin (I have looked at it with a 10X loupe) has no imperfections and is nice and round.
 

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I suspect that you will find that the pin hole you see is the result of the primer cap being mashed against the anvil (too small gap). RIO primers were notorious for this with a very soft cap and sometimes very little gap within between cap and anvil so that even a normal firing pin strike mashed the cap against the anvil.

If you are interested take a normal fired primer and one of the pinholed primers apart and check the anvils. I suspect you will find a raised piece of metal (manufacturing flash) on the end under the cap of the one that pinholed. The anvils are on a band during the manufacturing process and this is the attach point.

Just my 2 pennies

--- Chip King -----
 

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I may have used 100,000 Cheddite primers and never pierced any, that I've seen. As a matter of fact, I don't think I've ever pierced a primer of any manufacturer. And I've used them all at one time or another.
 

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Yeah, I'm guessing I've used 30k Cheddites and 30k RIOs without piercing any. (In a K-80, a KX-5, an AL-391, a few more).

Okay, so what? (I hear you saying). I suspect *some* primers may indeed be easier to pierce, particularly if the firing pin is a hair long, maybe the nose is a shade too pointy, whatever. It's hard to account for the conflicting reports otherwise.
 
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