Homemade Gelato

Last night Stephanie and I took a stab at making our own chocolate gelato. This morning we pulled it out of the freezer and taste tested. The texture was very good but the chocolate was overpowering. It was easy to see that my guesstimate of six ounces was way too high. Dry ounces? Fluid ounces? Avoirdupois? Troy? It's as confusing as metric vise grips. Now had the recipe called for scruples of chocolate...