As stated above, if you are "in them" you will need something economical and LOTS of ammo. For a educated dog town, you won't.....That being said we normally rotate 2 rifles (.223 for 300ish or less, something bigger for long shots) and have a 3rd as a spare. Never leave home with less than 400 rounds for every rifle. In 30 years of pd shooting, a couple times a year, I have come home with zero ammo about 6 times in my life. The least amount of shooting has been 100-150 per rifle in 2 or 3 days of shooting. We experimented with the .17 rimfires a bit when they came out and honestly, unless its perfectly calm, they just arent very effective. Fun to shoot, own a couple still, but just not for open, windy country. My something bigger reference would be .220 Swift, .22-250. .257 Roy, 6.5 something or other. Another thing to consider, if you have a big game rifle that you either need to practice with or burn up some "old" ammo, its a great way to do so. My current setup woul be alternating between a couple .223 heavy barrels and a 6.5-.284. Most fun you can legally have with a rifle....