Thread: 200 grain cast bullets in .357 magnum cases

I would start with the minimum load for 158grn and work up if I felt like it.

Your 200 grainers will extend a wee bit further into the case,so you will have less volume to worry about.

Are the loads you have found revolver or Rifle loads?
357 can be run pretty hot in a rifle.

Just record what you do,take it slowly and enjoy yourself.

I recently worked up a load for a Rifle without any published data for any powder I can get here.You have a starting point and quite a bit more steel round the breech.