Go with the 243. If you want them to learn barrel sights then buy a243 with barrel sights. I know savage and remington make them.You can always add the scope to it later. Bolt actions are easier and safer for kids just because you don't have to mess around with the hammer if they choose not to shoot. 243's are more accurate, kick less, and are fun to shoot. I think ammo is probably a little bit cheaper to.