I went to my local gunsmith today and asked some questions but I feel i didn't get enough information. It just seemed like he wanted to sell me the product. So I come to WMD to see if my questions can get answered. 1. First off i have questions about the caliber. Alot of guns are marked with the caliber .22, .30-06, .30, .308. some guns have 9x12 something something and same with the 30-06 what does that mean? 2. Whats a .308 WinMag? Are there different kinds? 3. Can all rifles shoot any type of caliber bullet that it is or smaller? 4. How can i find the best rifle for a first timer? I have more but i can't think of any at the moment. Thanks for the help!