I cast my own 180 gr cast bullets . Wheel weights , water cooled , RNFP design and yes they expand out some . My tests showed a stiffer charge (slightly compressed) of H110 / W296 and a small pistol magnum primer gave better performance than current load data . I was using a S&W 28 , 6" barrel . I don't have a chronograph to verify the velocity . Your results may vary !