Slowest powder for 5.7??

[Fotis]

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

Thanks

[panzermk2]

Neck separation is not the issue. The case not sealing and staying in the chamber would be.

[Fotis]

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

[panzermk2]

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.

[Grantness]

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]

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?

[panzermk2]

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.

[Toprudder]

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

[Grantness]

Me too