Originally Posted By: GCWould it be hard to duplicate? If you were really super serious about being exact wouldn't Federal Match brass, Federal Match primers, a Sierra 168 gr. MK bullet loaded to approximate the same COAL, and then any one of several suitable powders at the same velocity threshold get you there? You can tinker and fiddle with seating depth and/or powder type until you strike gold.
For whatever it's worth, I've "tinkered" with those rounds alot in the past, but finally gave up. You've got three of the ingedients right, but it's the powder blend that you just can't figure out. The other stuff is really simple by taking a few of the cartridges apart and take notes of the measurements, weight, etc, etc. You can even weigh the powder, but you just can't figure out the make-up of the powder. Probably one of the best kept secrets around.