Greetings: I am a new forum member. I am also relatively new to shooting. My experience has been limited to regularly shooting a S&W 22lf revolver with a 6 inch barrel and occassionally shooting a snub nose .38. I have completed a basic gun safety class and my application for a CCW license is pending.
I am preparing to order from Bud's a S&W 686 which will be used primarily as a range gun and for home protection. I am undecided between a 4" and a 6" barrel. I do not have the ability to test either before purchase. Can anyone help me with understanding the pros and cons of the 4" and 6" barrel in the 686.
By the way this will not be a carry weapon except possibly when hiking or camping. I intend to get a S&W 442 or 642 for carry. Thank you for your time and help.
(Hows work been this week buddy?) 
The accuracy you pick up in 2 inches is minimal at best. The 4 inch barrel will be much more versatile in the long run. I've owned a couple of what you might call hunting pistols, I would go with at least 8" for that. 
now if I can get you off the 45 thing.... 