Wildcat bullets

tmmcampbell

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Joined
Dec 9, 2008
Messages
390
What rate of twist is needed to stablize the 200 grain 7mm? Will a 1 in 10 do it? Looking for a bullet to shoot in my 7mm ultra. Thanks
 

geargrinder

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Joined
Nov 6, 2006
Messages
2,007
Location
Dayton, Nevada
What rate of twist is needed to stablize the 200 grain 7mm? Will a 1 in 10 do it? Looking for a bullet to shoot in my 7mm ultra. Thanks
I don't think so.

A 7RUM will probably stabilize them in a 9" twist, but will probably need a faster twist for anything with less velocity.
 

Buffalobob

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Joined
Jun 12, 2001
Messages
5,095
Location
Potomac River
Conventional wisdom breaks down with the really long bullets. Because they are so very long, the lead core and thin jacket make them susceptible to torque. You want to avoid over spinning them. The RPM limit is greatly influenced by the number of lands and grooves.

You can use "advanced search" to go back into the archives about 5 years when they first became available and see how the RUM people fared and what twists they were using. You will also find the velocities they obtained. As I remember it, the 9.5 twist people had some successes and some failures but nobody with a 1-10 succeeded.

This is an area where you really need to do your homework beforehand
 

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