I normally start around 10% low or maybe 3 grs low. Not interested in finding the best match accuracy and longest case life! Whatever is written in the manuals, I will switch data if need be for a different powder. The data in each manual is worked up in one certain chamber, at a certain altitude and certain temp. You probably don't get the same as they do; no big deal! A lot of people are afraid to use different data for different brand bullet's in different manuals. It's no problem at all, start low and work up, manuals are nothing more than a guide line.
