The B3D exporter will export the animations if you're using the skin plugin in max.
However you should still be able to convert to B3D via milkshape if milkshape imports MD3 with animation. If not, then you will need to exert some of your own skill and ensure it uses skin.
However you should still be able to convert to B3D via milkshape if milkshape imports MD3 with animation. If not, then you will need to exert some of your own skill and ensure it uses skin.