I am very new to this firearms scene and have ony just got my ticket. I now have a Ruger Old Army .45 which came with some "extras". I have 777 powder and a good few pistol balls in 451 and 457. My club sells 454. Can anyone advise me as to which size ball I should be looking to use? I have not fired it yet, I have been scouring the BBS looking for tips. 15 grains of 777 was advised, does that sound about right?