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Its for a model 29. Doesn't the case capacity affect the load? Are you saying I can take the load data right from a special and apply it to a full magnum case without having to worry about pressures? Will the velocity be the same? I'm confused.
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Velocity will
not be the same when using .44 special load data in a magnum case. Velocity will be lower, pressure will be lower as you are loading in to a larger area.
If you take straight .44 special data and use it in a .44 mag case, you'll see lower velocities than the same load in a .44 special. So, you begin to work up from there. If you have a chronograph, the work is easy. If no chrono, it's going to take a little longer and the results won't be exact.
But it's safe, as long as you aren't building squib loads and getting bullets stuck in the barrel.
Compare the same powder and bullet load given for .44 special and then for .44 magnum, and start with a load well below the .44 mag, and yet, above the .44 special load.
If you had NO brass on hand, it would make sense to go buy a supply of .44 special brass to build .429" light to medium loads for shooting in a model 29.
If you had a heap of .44 mag brass, but you still want a light to medium load, you can simply use that .44 mag brass and load it lightly.