DaleA said:
Not disputing you, just wondering why?
It has to do with equipment rules and courses of fire.
A 686 is most at home in IDPA, where revolvers are limited loading 6 rounds in the gun (and 4.25" barrels). You can use a 7-shot, but you'd have to index the cylinder everytime you reloaded,
and you'll likely be reloading with a twist-type speedloader (e.g. HKS), which tends to be slower than the push-type (e.g. Safariland).
In USPSA, each target typically requires 2 rounds, so to be able to do moving reloads (a big time-saver) with a 7-shot, you'd either dump the 7th round on the ground (becoming essentially a 6-shot revolver) or take the extra time to shoot an extra round on every cylinder. Either way, you'll be doing extra reloads compared to the 8-shot shooters. Those who do shoot 6-shooters in USPSA typically run moonclipped .45acp revolvers so they can run more powerful ammo, which gives them a bit of a scoring advantage. "Major power factor" from a 686 would be quite snappy, and the recoil would slow you down and become quite unpleasant to boot.
ICORE Classic requires a 6-shot gun. A 686+ would put you into the Limited division, where everyone else will be running moon-clipped 6- and 8-shot revolvers, so you're at many of the same disadvantage as shooting in USPSA.
I suppose you could competitively use a 686+ in some target games such as Steel Challenge, Bullseye (centerfire portion and Distinguished Revolver), but IDPA and USPSA seem to be the most commonly-held and available handgun competition for most.
All this may seem off-topic, but I've seen it numerous times where someone asks if they can use their 686+ for gun games. It's a bummer to tell them that while they can, that extra round is a big handicap. For this reason (and for speedloader availability), I happen to think the 6-shot is the more versatile variant. If someone wants more than a 6-shot capacity in a revolver, I'd strongly recommend stepping up to the 8-shot.