300aac weird crimp, Winchester white box

1806 Views 29 Replies 14 Participants Last post by Capona, Mar 13, 2022

russmerle

Discussion Starter · Feb 27, 2022

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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Flatfoot

· #21 · Mar 10, 2022

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

2 in. Mini Benchtop Cut-Off Saw

Amazing deals on this 2In Mini Bench Top Cut-Off Saw at Harbor Freight. Quality tools & low prices.

www.harborfreight.com

Yep. The harbor freight saw.

I've also used the dillon case trimmer to form the blackout case all in one motion, but its a lot of cutting for the dillon. I think using the harbor freight to cut off the neck is the better way to do it.

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russmerle

Discussion Starter · #22 · Mar 12, 2022

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

2 in. Mini Benchtop Cut-Off Saw

Amazing deals on this 2In Mini Bench Top Cut-Off Saw at Harbor Freight. Quality tools & low prices.

www.harborfreight.com

I’d look up the brass you’ll be trying. Some brass thickness can be a problem. I’m sure the poster knows and does it accurately. My buddy and I tried it and dug up some good info on what brass is best for sizing/necking for 300aac

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FLIGHT762

· #23 · Mar 12, 2022

russmerle said:
Is it normal on factory ammo? Or are these reloads? I haven’t seen it before on my commercial stuff

That neck crimp is a normal factory crimp. I see this crimp on nearly all factory ammo. It looks like a lee factory crimp die crimp because that what the factories have been using for many decades on bottle necked cartridges.

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Capona

· #24 · Mar 12, 2022

russmerle said:
I’d look up the brass you’ll be trying. Some brass thickness can be a problem. I’m sure the poster knows and does it accurately. My buddy and I tried it and dug up some good info on what brass is best for sizing/necking for 300aac

Please elaborate more on what the problem is with some brass. Is it that this particular machine can’t cut some brass?

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FLIGHT762

· #25 · Mar 12, 2022

Some brass will be too thick in the neck and will not chamber unless you neck turn the cases. Some brass works perfectly for the conversion. There's no issue with the chop saw cutting the brass. you need to research what brass works and what doesn't. You can cause yourself a lot of headaches if you don't know what you're doing.

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russmerle

Discussion Starter · #26 · Mar 13, 2022

FLIGHT762 said it. I’m not sure how to tell accept others folks experience with reloading. I went with my buddy telling me what not to use.

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Capona

· #27 · Mar 13, 2022

russmerle said:
FLIGHT762 said it. I’m not sure how to tell accept others folks experience with reloading. I went with my buddy telling me what not to use.

Ok great. Can you tell me what brass not to use? Is LC , and SSA brass to try if those are ok for conversion.

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Flatfoot

· #28 · Mar 13, 2022

I use LC brass to convert to blackout.

Heres a link to an article that lists different brass that is good to convert.

STICKY - Good/Bad brass list converting 5.56->300blk -300BlkTalk

www.300blktalk.com

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russmerle

Discussion Starter · #29 · Mar 13, 2022

Capona said:
Ok great. Can you tell me what brass not to use? Is LC , and SSA brass to try if those are ok for conversion.

This was about 4 years ago. XTAC (I had a bunch of it) and something else. We loaded them at his place and shot together. I see it’s on the list in Flatfoots sticky. That sticky has measurements too, that’s awesome.

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Capona

· #30 · Mar 13, 2022

Flatfoot said:
I use LC brass to convert to blackout.

Heres a link to an article that lists different brass that is good to convert.

STICKY - Good/Bad brass list converting 5.56->300blk -300BlkTalk

www.300blktalk.com

Thank you! Great info. Exactly what I needed.

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