Well, if your still in HS. Then you will get more guns when you get older. You said you want a coyote gun, that means, small cal., fast bullet, and very accurate. That means 204 IMO. Yeah ok the 243 and the 22-250 have been around longer, but since it came out in 04" alot of dogs have fallen to the new caliber. A 32 grn hollow point, or rapid expantion bullet at 4250 fps. If you want to hunt deer with the same rifle, go with the 243. If you want a varmit gun, go with the 204.