Went to a shop today and they had 3 1lb jugs of IMR3031. I used it many years ago and stopped because it seemed to burn too dirty. I came home and looked in my cook books. I don't reload .223 but son and good friend have poodle shooters. Good friend wants to reload for his mini 14. He has Lee setup I put together for him. My question is loading .223 with IMR3031 sample shows like 25.5 grn. After 25.5 theres a 25.5c. Does the c stand for compacted? I see I can reload 30/06 110 grn round nose with IMR3031. Looks like I going back for a jug $39.95 a lb.