Weight Distribution or Distance Spectrum for Conv. Coding.

Currently, I am looking for the union bound of my convolutional codes. Know that, I need the values of the weight distribution for my conv. codes before the calculation of union bound. Is there any one here has the value of weight distribution for coding rate-1/2,3/4,3/5,4/7 convolutional code (polynomial=[5 7],puntured from orignal code with coding rate 1/2). Or maybe relevant paper?Thank you.