Jasper,
Yes, I can see what you are doing.
With me I am not changing the SAAMI Pmax at all. I figure this is a industry safety constant that ought not be changed in the program, even though you can.
I am changing the Burn Rate factor, in 8208 for example from 0.62 (default) to .615. Entering the exact water capacity of the cases I use. Obviously cartridge OAL, and case trim length (mine, 38.5mm). That gets me pretty close in velocity to what the load is giving in velocity across the chronograph. I figure it will never be exact, in part due to ambient temp differences, and the starting friction of the bullet ('static coefficient of friction').
If all this is too far different than manufacturer tables then I defer to the manufacturer. Manufacturers will have used a pressure trace on a test barrel and fired actual rounds for evidence.
Have to remember to return the powder to its default burning values as the program does not do this automatically when exiting.
Did experiment with varying the Weighting Factor some time ago but never could get it to match ladders of increasing OCW testing. I leave it at 0.5.
Yes, I can see what you are doing.
With me I am not changing the SAAMI Pmax at all. I figure this is a industry safety constant that ought not be changed in the program, even though you can.
I am changing the Burn Rate factor, in 8208 for example from 0.62 (default) to .615. Entering the exact water capacity of the cases I use. Obviously cartridge OAL, and case trim length (mine, 38.5mm). That gets me pretty close in velocity to what the load is giving in velocity across the chronograph. I figure it will never be exact, in part due to ambient temp differences, and the starting friction of the bullet ('static coefficient of friction').
If all this is too far different than manufacturer tables then I defer to the manufacturer. Manufacturers will have used a pressure trace on a test barrel and fired actual rounds for evidence.
Have to remember to return the powder to its default burning values as the program does not do this automatically when exiting.
Did experiment with varying the Weighting Factor some time ago but never could get it to match ladders of increasing OCW testing. I leave it at 0.5.