ray first used was ww2 4831 surplus,Bruce iris that IMR 4831 or the Australian equivalent??
i think 59 to 60 gns was good for 130 gn bullets.
then we could not get that, and went to imr4831 which was a little faster burning and required a little less powder.
then came ar2213 with a burning rate equal to imr., loaded grain for grain.
then they changed ar2213 to ar2213sc which was slower, and like the ww2 stuff.
this same powder is also h4831sc.