Drag of a nerf dart.....?

Yes, Im literally asking this question XD. Im in college, and Im trying to help out some friends of mine in a club at Purdue called the Boiler League of Tag. Were trying to figure out the drag force of a dart in order to go about testing to collect data for pain factors (our guns hurt... ive left big bruises on people with one of my guns) I found online that the drag coefficient of a long cylinder is about 0.82, but i was wondering if m has anything to do with that since the darts are so light. Can someone please help me clear up this problem?!