I wanted one of the subject 2.5" 686PC guns but ended up with two 3" revolvers instead, as I came upon a regular 3" 686+ and a 586 L-Comp first.
I'll carry either of these as my primary handgun when I'm in a larger revolver mood.
I also have an 8-round 4" 627Pro, for an even larger potential carry revolver.
-I seem to be more accurate with the 3" 686+ but that's likely a combination of me and the individual gun.
-I don't know about IWB holsters as I'll carry my large revolvers OWB often from Galco:
Product List | All
I'm mostly using grips from Pachmayr:
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but sometimes Hogue:
K/L-Frame Revolvers - Smith & Wesson - Handgun Grips - Hogue Products
Perhaps somebody else has some knowledge about IWB L-frame holsters. I'll follow this thread and do some internet research on IWB holsters later.
Edit: Here's a company with a 686 IWB holster, Kramer:
Kramer Leather - Inside the Waistband #4 Gun Holster