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Thread: How do you determine barrel twist rate?

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  1. #5
    Member Marty Henry's Avatar
    Join Date
    Oct 2014
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    Tararua
    Posts
    7,330
    Define like eg sideways holes in the target, big random groups what? 308 is normally 1:10 and 148 gr should be in the sweet spot as thats the original bullet weight the roind was developed on. What is the twist rate anyhow, there is a formula for working out max bullet size for a particular twist but there are lots of other possible causes.

 

 

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