Great tool, and the learning curve is really quick.
Downloaded it when I was looking at new loads for a 6.5 swede, and the data was pretty much right on the money.
As for inputs from the user - barrel length and twist, and cartridge. Then you can select the powder manufacturer and powder type, bullet manufacturer, bullet type and weight, from the built in database.
At that point you start tutu'ing with powder charge, powder types etc, paying attention to pressure, velocity etc.
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