NOT KNOWN FACTS ABOUT AR COMP

I will drop back again a handful of grains and function up and find out what happens .I've and use alot of the 2400.Received 2 from the previous Enfields Number one MKIII's and want to check out it in them also,have not loaded for them yet but beeing a rifle bored out to 410ga it would be which i could bump them up a little bit far more,an ordinary