John,<br><br>Good info. This will probably provide a fairly good estimate, and if used for comparison will at least have the same errors for both weapons. The two confounding factors I see being that different types of powders are going to give different results (although they may just be accounting for the weight mostly), and one needs a meter to measure bullet velocity (although most reloading manuals give an approximate velocity). If using factory loads, you might know the velocity but not the weight of the powder. <br><br>As an aside, the 7000 is likely a conversion from grains to pounds, in case you are interested.<br><br>Greg