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As said, 700X is a fast powder, not slow.
You will note that they stop at 21,800 psi in .357 magnum even though the SAAMI maximum is 35,000. This indicates to me that 700X pressures are likely to get unpredictably high above 5.5 grains of powder even in magnum brass.
Don't do it.
You can do some interesting overloads with actual slow burning powders in .38 special, but I think it takes more research than you will get one question at a time on the internet.
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