308, i use a 22-250 a lot for coyotes & bobcat , and it works great, as for range, i rarely shoot over 200-250 yards, but have made a few kills out to 500+ yards, , its not how far your gun will shoot its how far you can shoot and make a kill shot,

most guys dont talk about their misses at long range or up close.shoot to kill . what ever the range.