Greetings @Jhon,
You can often used the start loads for a reduced load. My old Lyman and Speer manuals give 26.5 and 24.5 grains of IMR3031 respectively as start loads for the 150 grain in the .30-30. The latter develops 1,844 fps in a 20 inch barrel. It looks to me that your primers have backed out a little from their pockets. This suggests that the pressure is low enough not to stretch the cases and you may be able to just neck size your brass. This is what I do with my old .303 rifles to extend case life. Engraving of the cast projectile when chambered was considered a desirable feature to cast lead target shooters in the late 19th centurybut they always fired a round once chambered so your needs may differ.
Regards Grandpamac.
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