The MMP 3 petal is thinner than the harverster crushrib. Both give about the same accuracy, but the 3 petal seems to have a slight edge when you up the powder load. MMP told me that the 3 petal is the thinnest they had. I have the HPH 24's as well. They are not nearly as easy to load as the 3 petals. I have tried them all and I like the 3 petal the best.