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300aac weird crimp, Winchester white box

1794 Views 29 Replies 14 Participants Last post by  Capona
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I picked up a few Winchester white box 300aac, 147 grn to see how they group and for the brass. I’m also working on my own loads, these have decent muzzle velocity for what I’m looking for.

1) I noticed these at LC brass.
2) there’s an odd, almost octagonal, crimp at the bullet

Is this normal?

These were purchased as new from sportsman’s supply.

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That's looks like the same as Lee crimp die.
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They used a collet-type crimper for that... very similar to a Lee Factory Crimp die.
They used a collet-type crimper for that... very similar to a Lee Factory Crimp die.
Is it normal on factory ammo? Or are these reloads? I haven’t seen it before on my commercial stuff
Is it normal on factory ammo? Or are these reloads? I haven’t seen it before on my commercial stuff
The crimp does not bother me as much as the color of the cases. Can you get a pic of the whole sleeve of rounds? Notice how the primer stands out compared to the case? While some of this is normal those cases look a bit like reloads to me. Any extractor marks on the cases?
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The crimp does not bother me as much as the color of the cases. Can you get a pic of the whole sleeve of rounds? Notice how the primer stands out compared to the case? While some of this is normal those cases look a bit like reloads to me. Any extractor marks on the cases?
You can see an imprint just below the rim but it doesn’t have any ejector marks on the rim. The cases look to be slightly corroded with the brown spots. The brass could be DoD rejects too, I don’t know
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Not unusual at all... I have both some Winchester .30-30 and .30-06 cases that appear to be crimped that way.

Those spots are likely with what they might have cleaned the brass with after annealing, etc.
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Looks to me like a crimped in primer. I may be wrong.
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I am far more interested that the Case Head is stamped LC 300 BLK
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Thanks for the second look. I believe these now to be factory ammo that just has some grung and odd crimping. Also, I do not think those primers are crimped.

Do they fire well?
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Winchester is now running the military's Lake City ammunition plant. The crimp and blotches on the brass are normal for Lake City ammo over the past few decades. There is a video on YouTube showing the high-speed loading equipment used at LC.
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Winchester is now running the military's Lake City ammunition plant. The crimp and blotches on the brass are normal for Lake City ammo over the past few decades. There is a video on YouTube showing the high-speed loading equipment used at LC.
It’s all coming together now, thanks for the info. I’ll look up the video, I enjoy those.
Thanks for the second look. I believe these now to be factory ammo that just has some grung and odd crimping. Also, I do not think those primers are crimped.

Do they fire well?
Haven’t had a chance, I wasn’t sure if it’s be a return or not. I think I’ll keep them based on what’s been provided here. I think the one ding, just below the case head, is due to the loading machines. It doesn’t line up with my other 300/.223 once fired brass indents so i think it’s ok. Thanks for all the input!!
Looks fine to me. I’ve shot a buttload of 300blk, and have never used factory ammo or brass. All of mine are made from 223/5.56 with the necks chopped off. Haven’t had anything bad happen yet. That crimp does look just like the Lee factory crimp. I have some old LC m193 that has the same crimp style.
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The majority of 300blk I have is converted 223/5.56 also. I do have some Hornady ammo that has crimped primers. Not sure why that is necessary. I guess Hornady things someone is going to use them in full auto weapons.
The majority of 300blk I have is converted 223/5.56 also. I do have some Hornady ammo that has crimped primers. Not sure why that is necessary. I guess Hornady things someone is going to use them in full auto weapons.
What is involved to convert .556 brass to 300bo? I’d like to give that a try.
Cut the neck off just below the shoulder with a mini chop saw. Run the case through 300 blk size die, then trim. Its pretty easy.

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Thanks for that info. Are you using something like this to cut them down?

All of my LC brass, of any caliber that I have, looks like that or worse, but it still functions fine. The crimp on the bullet just shows the type of automatic crimper that the factory uses. Yes, it does look just like the Lee Crimper. I have never had any problems with any of my ammo where I used the Lee Crimper Die. It is also very forgiving on the crimp if some cases are a little longer or shorter then others.
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