It doesn't matter how many grains of powder they use, unless you know exactly what powder they are using.I'm not sure where you are going with this post. I have my ideas. I think you are looking for a duplicate load. Because they use x amount of powder doesn't mean you can use x amount of another powder.Every powder has it's own characteristics.Unless you know the exact powder they use DON'T TRY IT.If I'm wrong about your intentions I apologize. I just don't want anybody to get hurt or killed. Ruger Redhawk