Tried posting this yesterday, guess it was deleted. I noticed that my powder charge versus velocity plots were somewhat linear with my bullseye loads. I was loading to make major, and worked up a load to about 168 PF. So when I was making my subsonic 300 BLK loads I made three loads (that I knew were well within the safe region), plotted them, fit a line, plugged in the desired velocity to my equation and it spit out a charge. I loaded to the charge and I was within a few fps (equation was correct). I am trying the same thing with WST for my new pistol loads, again loading major. I made two loads this time (and assumed a linear relationship), got the data, made an equation and loaded rounds based on that. I have not chronoed those loads yet, but I suspect they'll be darn close. Is powder charge versus velocity mostly linear when your staying away from max charges? I know most everything in nature is non-linear and I suspect at the low end and high end it will be non-linear as well. However, if this holds up it sure makes my work up process faster and easier when I loading to a velocity.