I'm reloading once fired 223 and 5.56 brass for the first time. Some of the brass has a head stamp, LC and Nato circle. The 5.56 head stamp is IGM. From what I, have read Nato brass and 5.56 brass need to be reloaded with less powder becaues there is less room inside the case. I, am getting ready to work up a load, and need to know if the LC cases get the same amount of powder as the IGM? I, plan to use 24.5gr H335, 55gr fmjbt as a starting load for the IGM and LC. The 223 cases PMC, R P, Win are going to be 25gr H335, 55gr fmjbt.