One of the most important things to look at when setting up a casting rod and reel for tuna fishing is comfortability. You want a rod and reel combo that you can cast comfortably many times. Another thing to think about when setting up a casting rod and reel are its limitations and the size of the fish that you plan to catch with this setup. A good offshore casting setup is one that you can make multiple long range casts and effectively catch fish exceeding the 100-pound mark.