RE: Buying Mossberg ATR 100 need advice
The ATR is an inexpensive rifle and a great shooter I have a friend who has one and loves it, plus you can't beat the price. Your best bet on caliber for deer hunting will be the .243, .270, and the 30-06. I would go with the latter two for more diversity on game larger then deer. Probably the 30-06. These are some of the most popular calibers out there and ammo is plentiful and affordable.