Is .223 or 5.56 Better?
This video clarifies the differences between .223 Remington and 5.56 NATO ammunition, primarily focusing on chamber pressure and chamber dimensions. It emphasizes that while similar, 5.56 NATO operates at higher pressures (around 58,000 PSI) compared to .223 Remington (around 55,000 PSI). The instructors strongly advise against firing 5.56 NATO in a rifle specifically chambered for .223 Remington due to potential catastrophic failure, while noting that .223 Remington is generally safe to fire in 5.56 NATO chambers.













