I conceal carry Revolvers every day. I also have several of them, to include a 2.25, and a 3 Inch SP101.
I carry in a Rocky Hill Pancake at 3:30 - 4 O'Clock. This positions the Revolver Muzzle over my Right Back Pocket.
With a barrel length over 3 Inch you probably will not be able to access that pocket. The 3 Inch is right at the top of most of my pockets.
My best advice is to get the shorter barrel SP101. I tend to carry my 2.25 more than my 3 Inch.
My 2.25 SP101 and the Rocky Hill Leather Pancake
This one has been slicked up, has a Wolff #8 Trigger return Spring and a #10 Hammer Spring. It also has the Full Shim Pak installed. A .005 on each side of the Hammer, a .005 on each side of the Hammer Dog, and a .003 on each side of the Trigger. It is about as slick as you can get an SP101.
The SP101 has a Gemini RED Fiber Optic Front Sight. HUGE Improvement in picking up the Front Sight
This is a Big Creek Kydex Belt Carrier for the F Model Jet Loader which is THE Speed Loader for the SP101. They are a pretty well kept secret. The only sources I am aware of would be Power Custom, and Pistoleer. Also shown is the HKS 36. The Jet Loader is 3/4 Inch Taller than the HKS 36. The HKS 36 is a very good speed loader, but suffers some from Frame Clearance turning the knob. You also have to use a technique reloading which anchors the cylinder so it does not turn when you turn the knob. The Jet Loaders .75 extra length, and Push Down to release operation is way faster.
If SNUB Matchs were more popular and common this would be the only speed loader used in a 5 shooter with J Frame/SP101 cartridge spacing.
Which ever barrel length you ended up with an SP101 is hard to beat.
Bob The Revolver Guy