RE: 223 ammo question
Yes you will need to go to the range to resight your rifle.
The new ammo may or may not impact the same spot as the old ammo. Most likely it won't.
"The danger to America is not Barack Obama but a citizenry capable of entrusting a man like him with the Presidency........... Blaming the prince of the fools should not blind anyone to the vast confederacy of fools that made him their prince. The Republic can survive a Barack Obama, who is, after all, merely a fool. It is less likely to survive a multitude of fools such as those who made him their president."