7mm-08 or .308 will do all that you need to do...Others may do it past 300 yards, but most can't hit past there anyway...
Get a gun you love to shoot, become a great shot and caliber won't be an issue...
If you are staying in Maryland, get a .243, it will make you a much better shot because you can use it on crows, groundhogs, deer, coyotes and other varmints...