You may also want to join The High Road forum and then join the Ruger Old Army club there.
http://www.thehighroad.org/showthread.php?t=538088
Members get a 10% discount from ClassicBallstix aftermarket cylinders that hold an additional 5-10 grns of powder and are very well made by all accounts.
In case you aren't aware your brass framed Remington shouldn't be loaded with stout powder charges as it will batter the frame. A max load for it would be somewhere around 20-25 grns of 3F powder.