Do the most shooting with the gun with the crummiest trigger. If you can shoot well with a bad trigger, you can shoot anything. 6" groups with a DAO pistol at 50 yards will translate into 1.5" with your Blackhawk. 2" groups with my M-N helps yield one-holers with my serious shooters.
You can practice too much, too! Blowing up 500 rounds does no good if you become fatigued at 200. I would go to the range and really shoot for score maybe once a month and go through 100 rounds max with my Blackhawk .357. That's not saying I don't go plinking. Plinking, though is just messing around trying impossible shots, rapid fire, stuff like that, but it is NOT a serious shoot. It should be as close to play as you get when a firearm is involved...In short, you can't always be shooting for score, or you'll lose proficiency and enthusiasm.