For a Hunter games local match, just run whatever you are cooking and see what you like or dont like. Thats what these matches are for, testing gear.
If trying to develop a sweet field setup, some way to get an elevated shooting position is a must. It can be a pack, extra long bipod, tripod, shooting sticks, etc. I believe the tripod is the most versatile. Lots can be done without them, but everything seems easier with them.
If only working to develop a specific NRL Hunter 2 day match setup, a tripod is damn near mandatory to do well. I have seen some do well without, but its tough. A triple pull ckyepod is also pretty handy.
Either way, one day Hunter matches are a great way to go shoot plates and explore whatever pursuit you want.