Effect of extrusion condition on the rheological response under elongational flow at capillary extrusion is studied using isotactic polypropylene (PP). Drawdown force, defined as a force required to stretch a polymer melt uniaxially, is found to increase with the die length. This is owing to the molecular orientation in the long die, which provides rapid crystallization. Moreover, the swell ratio decreases with the die length, owing to the low density of entanglement couplings.