300 WSM factory ammo

[mjcmichigan]

This was a Winchester PowerPoint 180gn. The cases are a little long. Measure 2.115 and similar. The whole box had the marks. I would not think a case could touch lands because of the free bore, but I can’t guess what else made those marks.

To of the 20 cases were cracked in the neck after firing.


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[hunter24605]

Remains of a factory collet crimp?

 

[SJB358]

Remains of a factory collet crimp?

Yup, that is the crimp mark.

 

[mjcmichigan]

Thanks! Guess I’m tired, should have figured that out!


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[ozarkpugs]

I'm stuck on 2 out of the box having split necks

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[mjcmichigan]

I can’t say I’ve seen factory ammo crack on the neck on first firing.

Seems to be brittle brass.

No overpressure signs.

I suppose if the necks were not proper thickness, bad things could happen.

I annealed the remaining cases before resizing.


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[hunter24605]

I can’t say I’ve seen factory ammo crack on the neck on first firing.

Seems to be brittle brass.

No overpressure signs.

I suppose if the necks were not proper thickness, bad things could happen.

I annealed the remaining cases before resizing.


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That is concerning. I never ran across a split neck with Win factory in my 325 wsm, but that was 4 years ago, not sure if something has changed, but might want to call it to Win's attention, I just finished reading this the other day.

https://www.thehighroad.org/index.php?threads/split-necks-in-300wsm.728743/page-2

 

[mjcmichigan]

Thanks for sharing. These were older as I got them with the gun, I’d guess between 10 plus years old. If they were new, I’d call Winchester today.. given, I shot all the hand me downs...

Of the cases I made, with fresh purchased Winchester brass, I have not had that problem.

Guess I should get online and order a Redding set.



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[elkeater2]

Those are pretty deep and significant leftover crimp marks - much more than I'm used to seeing. Many nearly disappear on firing. Just wondering if heavy crimp might have contributed to the two cracked ones. Sounds like you've got it handled, but it is a puzzlement...
EE2

 

[mjcmichigan]

That’s a great thought!




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[preacher]

Some older 300 WSM factory loads were genuinely "hot", like Weatherby stuff. Maybe they have it sorted out by now as it is a very popular round.