5.56 headstamp

I would like some help in the ID of this head stamp please. FMc 5.56 it is just a brass case without a primer…thanks…paul.

Paul, can you post a picture?

Is there any possibility that the letters in the head stamp you describe as FMc be reversed and that they read MFc.
If this is the case MFc indicates a small commercial loading from “Ammunition Factory, Footscray, Victoria, Australia” circa late 1970’s.

You know I looked at that so many times and yes you are right, it should be MFc. Need to slow down, just trying to sort a load before the Bisley show! Thank you both for responding…paul