I think the 270,30-06,30-30,308,243, and non magnums calibers would suit you fine. The main key is practice practice practice. And not all hunting situations will be off the perfect rest. Try leaning up against a tree or fence post while practicing also. Forget shooting long range till you have developed a knowledge of your cartridge and distances. You want your first animal you take to be a clean kill. Its ethical and totally a hunters responisiblity to learn and shoot his rifle. Pick your spot on the animal and aim there don't shoot at the whole animal. Most important wait for the best opportunity shots such as broadside and quartering away. Good luck