Winchester LP primers not sealing off pockets

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  • Last Post 23 June 2021
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GBertolet posted this 08 June 2021

I have noticed that the Win LP primers are pitting the breachface of my 45acp 1911. Federal and CCI primers do not do it. I suspect that the Win primers have a harder cup, and the low pressure of my 45 acp loads, do not allow obturation, allowing hot gasses to flow past the primer.

Being we have a primer shortage, and Win primers are all that I have, I would like to make a workaround. Would one of the commercial bullet/primer sealers be enough to block off the leaking gasses?

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Bud Hyett posted this 23 June 2021

I've noticed this problem before, especially with W-W primers. I observed the leading edge of the primer was rough and interfered with seating. Whether the plating was not controlled, the forming die for the shaping was worn, or the cut primer blank before forming was worn and rough would be hard to tell. The uneven edge could allow gas leakage. Once the case started into the pocket, there was no more than "normal" resistance.

I sort brass by brand and attempt to get it sorted by lot number if new brass. Three hundred cases are allocated to each match rifle since a two-day Regional Match or the Nationals need the reserve loads for sighting.

In this day of shortages, I am using Federal primers on all loads except Alice's .308 since we started that load with W-W primers. There is strict primer rationing at the Hyett household. Once I am out of Federal Large Rifle, the loads will be exclusively W-W since that is what I will have left. 

Hopefully, there will be primers available at reasonable prices by the Fall of 2022. 

Farm boy from Illinois, living in the magical Pacific Northwest

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GBertolet posted this 21 June 2021

I measured some primers. Federal primers were .2105 in diameter, the problematic blue box Win primers were .210.  I found some older Win primers, that were in the white box and nickel plated, and they averaged .2105. Would that 1/2 thousandth make a difference?

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RicinYakima posted this 09 June 2021

Usually tried to use WW primers in WW brass and Remington primers in Remington brass and Fed in Fed. In the olden days CCI's were always the largest in diameter and were just about impossible to put in WW cases in the winter in the shop. But then I normally clean primer pockets and recycle range brass I pick up, unless it appears to have been never reloaded. FWIW

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Boschloper posted this 09 June 2021

Some time back I was using Win LP primers and R-P brass for mid range .44 mag.  I was getting frequent pierced primers and gas cutting on the firing pin and breech face. After considerable experimenting, I concluded that at least that lot of primers and that lot of brass were incompatable.  Since I have brass from just about everyone my solution was to stay away from Win primers. Our current situation may make it difficult to use another brand of primers but you could sort your brass by brand and do a compatibility test.

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M3 Mitch posted this 09 June 2021

Well, mastering the obvious, you could try increasing your load some and see if that cures the problem.

 

If you have a taper crimp die, you *might* (judiciously) increase the strength of the crimp. 

I guess you are using Bullseye, 3.5 of that is one of my favorite "softball" loads for the .45 ACP.  I think Bullseye is going to give you the sharpest pressure rise and best chance of obtruating (sp?) the primer.

If none of the above solve the problem, maybe you can trade the WW primers for another brand with somebody on here.

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Tim DeMarais posted this 08 June 2021

Using the Winchester primers may have changed the performance of your load. If the pressure and velocity are the same as your loads using Federal and CCI  there could be an issue with the primers.

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MP1886 posted this 08 June 2021

Mic your primers and you'll probably find the reason Winchesters are loose.

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GBertolet posted this 08 June 2021

I mainly use range brass. At the action shooting matches, recovery of your exact brass is impossible. How many times they have been reloaded, is unknown. If the primer pockets are enlarged, why does it only happen with Winchester primers, and not Federal or CCI primers. There has got to be a reason.

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Tim DeMarais posted this 08 June 2021

Your primer pockets may be enlarged, even with low pressure loads, if they have been reloaded too many times.

I do not think primer pocket sealant is a good solution.

 

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Duane Mellenbruch posted this 08 June 2021

What are the head stamps involved in the cases that are giving you problems and is it possible that the cases are suffering from enlarged pockets?  Or are you finding smudge marks on all cases, regardless of maker?  What are you using to clean the primer pockets to make sure debris is not a cause of leaks?

Is it your intent to apply sealant and then install the primer or apply sealant after the primer is seated?  Or both ways and see if it works at all?  This seems to be an issue I am not reading a lot about on other forums.

 

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