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Author Topic: Twist rate?  (Read 491 times)

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Offline Steve E

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Twist rate?
« on: October 12, 2011, 11:28:45 AM »
What would be considered the ideal twist rate for the 357 Mag and the 357 Bain & Davis using 158 to 180 grain bullets in a 20 inch barrel?
I know Ruger uses 1-16 for their 77/357.
Steve E........
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Offline gunnut69

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Re: Twist rate?
« Reply #1 on: October 12, 2011, 08:28:54 PM »
There is a formual to calculate the twist rate but I don't remember it. Perhaps a GOOGLE search would work or perhaps some one here remembers it?
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Offline Nobade

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Re: Twist rate?
« Reply #2 on: October 17, 2011, 03:07:56 AM »
Greenhill is (150*(dia*dia))/length, all in inches. Not perfect, but has always worked for me to get in the ballpark. This is with lead bullets. For solid copper or light stuff use a lower constant, say 130 or so.
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Offline Steve E

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Re: Twist rate?
« Reply #3 on: October 22, 2011, 05:41:59 AM »
Would that be the total length of the bullet or just the bearing surface?

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Offline Nobade

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Re: Twist rate?
« Reply #4 on: October 22, 2011, 02:51:45 PM »
total length.
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