I understand that grains does not mean actual grains of powder, But I do not understand how a 44 magnum cartridge can have 300 grains while a 300 win. Mag cartridge can have as little as 180 grains and yet be twice the size of the 44 cartridge cartridge. Could somebody educate me please? It's confusing to me because I used to think the more grains the more power, hence in my feeble mind the 300 grains in a 44 should be stronger than 180 grains In the 300 win Mag.