So wiki has a good page telling about the different calibers our there located here ( Caliber - Wikipedia, the free encyclopedia ) ... I'm sure a lot of you are familiar with it. Is there a similar page somewhere that explains what exactly certain rounds are good for? For example, what is the real difference between a .30-30 and say a .270 ... or a .30-06 and a .303 ... or a 7mm and a .338 ... or a .338 Lapua and a .338 RUM ... just something along the lines of suggested ranges they are good for, size game, etc. I know you can find a lot of scattered info all about but nothing sort of all in one stop. I'm just curious.