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H110 or 296 have been my top two magnum powders for both 357 and 44 mag for some years now. Great accuracy with all bullet weights.
An old lot of AA #9 has produced excellent results.
Not cheap , but VV N-110 has given me best accuracy out of a 10" TC 357 with little muzzle blast and very clean burning. I am going to try it in 44 mag soon.
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