Slowest powder for 5.7??

Reloading info for the 5.7x28mm

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Fotis
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Slowest powder for 5.7??

Post by Fotis » 22 Jan 2023, 11:06

Basically for 40 grain bullets. What's the slowest one can get by without neck separation??

Thanks

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panzermk2
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Re: Slowest powder for 5.7??

Post by panzermk2 » 23 Jan 2023, 11:54

Neck separation is not the issue. The case not sealing and staying in the chamber would be.
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Fotis
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Re: Slowest powder for 5.7??

Post by Fotis » 24 Jan 2023, 09:23

panzermk2 wrote:
23 Jan 2023, 11:54
Neck separation is not the issue. The case not sealing and staying in the chamber would be.
Correct that is what I meant. I worded it incorrectly.

I wonder how Win 572 would work? Slightly faster than HS-7

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panzermk2
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Re: Slowest powder for 5.7??

Post by panzermk2 » 24 Jan 2023, 11:38

Big flaky ball powder like that does not meter well into the small 5.7 cases. It's really easy to load a over pressure round when you push it to the limits.
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Grantness
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Re: Slowest powder for 5.7??

Post by Grantness » 25 Jan 2023, 06:09

https://www.handloadermagazine.com/winc ... 572-powder

Aside from the poor metering, I’d b interested to see how it performs. 571/HS7 was good stuff. 572 may be faster/more efficient?

Fotis
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Re: Slowest powder for 5.7??

Post by Fotis » 26 Jan 2023, 09:53

panzermk2 wrote:
23 Jan 2023, 11:54
Neck separation is not the issue. The case not sealing and staying in the chamber would be.
Jay:

Would the new smith with the locking/rotating barrel be better suited to slower powders for better performance due to the delay in unlocking?

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panzermk2
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Re: Slowest powder for 5.7??

Post by panzermk2 » 30 Jan 2023, 09:51

Nope, the issue is case size when it comes to slow powders.

Now IF it's a well made pistol the system will make handle hotter loads and faster powders.
Jay Wolf
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Toprudder
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Re: Slowest powder for 5.7??

Post by Toprudder » 01 Feb 2023, 11:47

I have a pound of 572 on the way. If I get a chance I will work up some loads with it.

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Re: Slowest powder for 5.7??

Post by Grantness » 01 Feb 2023, 13:50

Me too 8-)

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