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H4895 has been my 'go to' powder for the .204, but several others also work well. Be sure to use CCI 450 magnum primers, especially if you're experimenting with hot loads, as they have thicker cups than most other types.
just got a 204 first load I tried was 28.1 grains of ramshot tac behind a 39 gr seirra blitzking fou shot group in less than ideal condition covered by a nickel, now going to try to work a load for 32 gr v-max.