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I am not sure about you but before making recomendations on powder charges you might want to know what weight bullet he is loading... How did you come up with 18-20 grains would be good for him?
Thats what I am using in my ar too
I was more concerned about the person giving out random reloading info... i'll see what I am loading mine too I have a really light load and a full power load... how long is your barrel ?
IMR3031 is all I use for my 55 gn FMJ 1/12" AR-15 . For some reason it really likes this powder and works most effectively on the odd gopher also. Since it is a cylindrical powder you kind of have to give it a shake first to get it all in there sometimes.
I only use 3031 in the .223 and .222 55 - 62 gr FMJs reloads I do. This caliber seems to like 24 grains but I have tried 25 gr Varget with 69 gr SMKs with great success.