Sorry for the misunderstanding, I am looking for a cartridge not a caliber. Didn't realize people took that as serious as the clip and magazine issue. I currently hunt with a .308 marlin express and a 30 TC, with a .243 win as my "back up" for those two and for coyotes as I primarily use a .22-250 for that. The debate I am at is if I want to keep the 243 the cartridge it is or go to something else that is better. I did not state that earlier because when I tell that to people they just say stick with the 243, it will do fine. I know it will do "fine" but when I get this gun done I want it to be perfect. I like the 243 round, but if any other 6mm or any 6.5, 7mm, .30 cal, or even something in the .270 range would be "better" I want your opinions. Many of you have gone through what I am going through, have made mistakes and have gotten it right. I want to know which calibers and cartridges have worked best, or might be overrated or underrated. Thank you all for your help and advice to a rookie.