I've got a copy of a Winchester Components Catalog, which includes some reloading data. Here's what is listed for 230 gr FMJ and WST, which I assume is the same as Winchester Super Target.
4.1 gr, 710 fps 15,500 psi.
4.9 gr, 800 fps 19,900 psi.
4.9 gr is listed as the max charge. Primer, case, and weapon are not listed for this data.
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