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Message: <blockquote data-quote="7stw" data-source="post: 2276817" data-attributes="member: 18402"><p>You only have 3-5. Gr more capacity than a .220 swift. So you could use that as a start or if you can find .22 cheetah data you could reduce it and go from there. <a href="http://benchrest.com/archive/index.php/t-51826.html" target="_blank">http://benchrest.com/archive/index.php/t-51826.html</a> also give the above link a view. It gives some data for a .22-243. I've never used any h380 in anything so I have no experience with it. But it's burn rate is similar h414 and varget which will work in a .220 swift. Hope it helps.</p></blockquote><p></p>