I just got back into shooting after a long time away. Just bought Dillon 550b. I have never reloaded for 223. I have 2 rifles LWRC M6A3 14.5 in barrel and a Bushmaster ACR in 16in. Most of my shooting will be for fun and mybe later move on to 3 gun. If anyone could help me out with a good load,powder and bullet, I would appreciate it. I will be using 55gr bullets. Thanks