Reloading 357 Magnum Episode 7 - Using IMR 4227, Lee 358158RF, And CCI 550 Magnum Pistol Primers

It's a "Round Flat" design, not a "Round Nose".

Anyways, here we are exploring with IMR4227 today with an initial load development for this Lee bullet. ... https://www.youtube.com/watch?v=cxRI422D_JY