Have you thought about using the Quickload software? It has most powders and a lot of different projectiles in its database. Let's you adjust the input for barrel length, seating depth and pressure amongst other things.
It's not a be all end all answer but it let's you crunch numbers and compare different loads before going out and buying powders and projectiles.
See review below.
http://www.6mmbr.com/quickload.html
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