The 4", 6-shot, 686 is THE all-purpose revolver.

A 6" isn't allowed in some games.

As said above, a 6" isn't that much different energy-wise to make a large practical difference - a caliber difference is required for that.

Better balance. Better wielding. More conceilable. Less weight.

The 7-shot version is in no-man's land. If capacity is a concern get an 8-shot, and if it's a real concern get an auto. It's useless in the most popular games. It won't make a perceivable difference at the range. If you need the extra shot for hunting you shouldn't be hunting. ;-) Speedloaders and moonclips are readily available should you wish.

The 6-shot makes a much better all-purpose gun.

6-shot, 4" bbl S&W 686 is the all-purpose revolver!