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Save your self a lot of grief. Get the Lyman or RCBS cast book. First off the round ball you cast I hope that was pure lead and not wheel weights or something else hard. You may get away with W/W but its not a good idea. Muzzle loaders and shotgun slugs are to be cast out of pure lead. W/W make a good lite load for the 357. Also it is highly recommended to slug the Barrel of the gun you will cast for, The 3030 you mentioned will be some where between .309 to .311 in Dia, A bullet cast from different alloys will cast at different Dia, the 3 main cases for leading are. Wrong Dia bullet. Pushing a soft bullet to fast. Or pushing a hard bullet to slow.
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