I have been burning my way through 14# of this powder from Higginson's over the past couple of years. For all practical purposes, it is identical in burning rate to old H450, which puts it in the H4831 area, possibly just a tad quicker. It works very well in a couple of my 30-06's with the 180 grain bullet at right around 60 grains. [please start at 57 and work up carefully] My Chrony says 2680 in a 24" barrel at 60 grains. No pressure signs, easy extraction, quite accurate. One caution: There was another lot number of WC852, not from Higginson's, that was considerably faster burning [more like 4320] That would present an issue if you had some from a different source. Regards, Eagleye.