0 replies to this query on another site. I have zero luck calculating or, more importantly finding bc's for the magma molds boolits in: 30-30 165 gr 0.308 diam., 40-65 260 grain .408 diam., 300 grain 45-70 0.458 diam., and 350 grain 45-70 0.458 diam. Even called Magma and they do not have them and made some reference to an old out of print (unremembered title by Magma) publication which I have been unable to find and reference to. Any info much appreciated. Thanks