Hmm, depends really on if you are going for big logs or the more illusive intricate twigs. If you are going to hunt for logs, you probably can use a .308, but I would recommend maybe getting a special permit to use a 7.62 rifle. If you are over 65 or have a special disability permit, you can hunt logs any time of year with any ammo. If you are looking for those feisty twigs, any .22 would be fine but try not to hit the tap root. Hope that helps.