I think a lot of the posts have covered the humorous, but if you are serious about making your 30-30 a rifle that can quickly engage targets at short range, I would say put a good micro red dot sight like the Aimpoint H-1 (or T-1 or R-1) on it. Have a ghost ring sight setup as a backup.
With an appropriate zero, you should be able to hold dead on out to around 200 yards with impacts not more than 3" above or below point of aim. A person who can shoot accurately past 200 yards without magnifying sights is truly exceptional, and the 30-30 practical effective range is probably not much more than around 200 yards.
I've been thinking the red dot sight would be good for the 30-30 for hunting situations, too.
