Production of controlled-rheology polypropylenes (CRPP) is practiced industrially by modifying existing commodity Ziegler-Natta resins through peroxide-induced β-scission reactions resulting in materials with controlled rheological properties and accompanying narrower molecular weight distributions (MWD). In this work, this methodology was studied using both metallocene-based polypropylenes (mPP) and Ziegler-Natta based polypropylenes (ZN-PP). Numerical simulations based on a previously proposed kinetic model indicated that the nature of the starting resin has a significant effect on the control of MWD polydispersity index (PDI) and weight-average molecular weight (MW) of the resulting CRPP. Based on these observations, experiments were carried out to demonstrate the feasibility of producing CRPP with targeted molecular and rheological characteristics. Commodity mPP and ZN-PP resins were selected to produce CRPP with similar MW or melt flow rates (MFR) and varying PDIs. The rheological properties and MWDs of these materials were evaluated through oscillatory shear and gel permeation chromatography (GPC) measurements and their extrusion behavior was studied and correlated to these properties.