I don't currently own a .243, but I have an old Remington 788 in 6mm Remington. It's my favorite antelope rifle. As the magazine only holds 3 rounds, I carry a spare in my pocket in the event I need it. Most of the time I don't but the assurance is there. One of the longest shots I've taken with it was 387 yards resting over a fence post and holding a bit high (back before modern rangefinders). The animal went right down.