RE: 12 Gauge vs. 20 Gauge shotgun
The 20 will be fine. You may not have the range but don't worry it will have plenty of range no matter what you are hunting(birds small game or deer).
Many of the guys on here have a bigger is better philosophy and think the 20 is a sissy gun. I hunt with a 12 but my first was a 20 and Ikeep it closestill.