I'll drop back again some grains and perform up and find out what comes about .I have and use alot from the 2400.Acquired two with the aged Enfields Number 1 MKIII's and would want to test it in them also,have not loaded for them yet but beeing a rifle bored out to 410ga it might be that I could bump them up a tad more,a standard 410 shotshell wont