I have been wanting to get into the Cowboy Action sport. I have a Ruger SA convertable in .32mag/32-20 with adjustable sights and a modern hammerless side by side double 12ga. Is this a good start? If I had the 12ga. barrels cut from 28" to 20 or 22" would I need it rechoked or would cylinder bore be O.K? I see in my latest Shooting Times that there will be a regional shoot in Oct. in Quincy Ill. Where can I get more info on this? I have to work most weekends so maybe I won't be able to do much but plan ahead to at least spectate.