Free: Contests & Raffles.
A bad shot is a bad shot. Whitetail are so small the 0.065 size difference will not matter. 0.065 is less than 1/16 of an inch. Yes, the 308 and others will have more power, but in 90% of all hunting applications that power is wasted as most shots, ESPECIALLY a beginner, will be under 200 yards, and most of those will still be under 100 yards.
Surprised nobody suggested .30-30 lever gun.