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Old 04-29-2017, 08:12 PM
Jim Watson Jim Watson is offline
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Quote:
Originally Posted by apollo99 View Post
Generally speaking 1:9 good for 55 grain 1:8 55-62 grain 1:7 62 grain and up. That's not to say you can't shoot any grain out of any twist barrel, but there is an optimal twist for a given bullet weight for stabilization. I'm giving a very simplistic version of this.
I always wonder why the Internet tends to generate grossly overspinning bullets, especially in .223.

A 55 grain flatbase spitzer has been stabilized by a 14 twist with excellent accuracy for several decades now, certainly the 1958 .222 Magnum the .223 is based on and no doubt a bunch of earlier wildcats.
The Pentagon found a 12 twist needed for the 55 grain boattail in cold air.
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