I have had a RCBS media separator for years. Used to use a Dollar Store colander too. I thought the separator was a gimmick but I quickly realized it plain works!
What gun are you loading for? You can try 2400. It has a nice pressure curve without getting a big spike with warmer loads. 2400 needs good neck tension and a firm crimp. I would shoot for .003 to .005 neck tension. Have you measured your throats? I would not use too hard a bullet. I...