3 oz will be one of the larger model surface iron (Salas 7X). A small iron weighs around 2.2 oz (Tady C). If you would like to have the widest range for casting all sorts of sizes go with one of the above choices-690 or 90J. Those have an action that fits the bill will a Tady 45 and Tady C weight range from 2.8-2.0 oz. Covers a few different jig makes and models.
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