223 Remington vs 5.56x45mm reloading help
Hello, I am new to reloading my own rounds and I have this book that gives me all of the information on how to do so. It does not how ever tell me the measurements the 5.56x45mm, can i use the 223 Remington measurements ? Are they the exact same and is it safe to use that type of ammo in my (Stag)AR-15?
Any help would be appreciated.