When I look in my Speer reloading manual I see multiple powders that can be used for the same bullet, arranged in order of fastest powder to slowest. My question is, I do not want to buy all 12-15 different powders to see what would work best in my rifle with that particular bullet. So how do you make your best guess at which one to buy? I have a buddy that has several reloading manuals and one of them (I cant remember which) shows which powder is "the most accurate" out of the bunch for that particular bullet out of the specific rifle they shot it out of. Is that a better way to go and would it be resonable to start there?