What's the difference in 5.56 and .223 ammo,anyting?I've been told not to shoot 5.56 through a .223 rifle.I've shot it in my model 10 ,no problems,and accurate.A tech at DPMS told a friend of mine the the chambers are different from a 5.56 to a .223,and pressure is higher on a 5.56.But he said the cases are different on the INSIDE of a 5.56 from a .223.My question is what does the inside of the case being different have anyting to do with the chambers?CAN ANYONE HELP? ???
JEFF