Originally Posted by jwp475
By seating the bullet farther into the case by .2" you readuced the case capacity and therefore increased the pressure
To further expound.....
You will need to modify the start pressure setting to account for pressure differences unique to your rifle/throat/bullet combination when changing seating depths. That is not an automatic feature...the user will need to input this.
A method I've used successfully, is to load a string of rounds at varying charges, at all the same seating depth.
Record the velocities for the string.
Then use the case weighing factor/start pressure to "calibrate" QL for your rifle, until you can plug in the lowest charge and see a velocity that matches what you saw for that charge, and then do the same with the high charge.
When I'm able to input the "low charge" of my string, and the "high charge" of the string, and see that both velocities are close to what the chrono saw....then I feel good about the start pressure/case weighing factor for that powder/bullet/seating depth combination.
You then should be able to correlate the case weighing factor/start pressure figure to other powders, but not seating depths....if you change the seating depth, you'll need to make a change to start pressure once again.
This all assuming of course, you can trust your chrono results, and didn't forget to account on the effects of temperature can have with your powder
Reminder/disclaimer....QL is not a substitute for a pressure barrel in a laboratory with a strain guage. One must exercise caution, especially when operating at the upper performance levels IAW published loading data when available.