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Use the data for the 250 grain Keith-type bullet. According to Alliant data a max load is 20 grains of 2400 for a speed of 1390 fps.
I use 2400 in my .44 magnum and 19.0 grains of 2400 gives me 1345 fps with a 240 grain hard-cast bullet.
A general rule of thumb in reloading is that when you can't find a load for the precise bullet you're using, it's safe to use data for a heavier bullet of the same type.
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