While the Win Mag has a better capacity for cast bullets, the Lott has a more cast friendly throat. The drawback of the Win Mag (for cast bullet work) is its wide, long throat. It starts off at 0.469" at the end of the chamber and gently tapers to reach the rifling and is over 1" long. So a cavernous throat with no support for the bullet in a straight tapered case. In contrast the Lott has a relatively short, conventional throat that's around 0.20" long. While you can get the Win Mag to work with cast, it won't be as easy or as flexible as the Lott.