I found for me depends on distance and direction.
If it’s a long distance, I may either reload before or when I get there, I’m trying to move as fast as I can and not worry about anything else.
if it’s a short distance, I may reload while moving, due to not enough room to generate any speed.
if there’s any possibility of breaking the 180 on a reload, I’ll reload before leaving.
Im sure I’m doing it completely wrong.