Does anyone know why the Hornady manual in the 223 section only goes up to 60 gn bullets? They have a service rifle section for the 68 and over, but unless I'm mistaken a service rifle uses a NATO chamber and throat. Right? I'm trying to get good data for a 223 Rem Mod 70HV with the 68 HPBT and this manual has me baffled at how it is put together..