You need a steel reinforcing band to carry an revolver in an IWB holster. Pressure of the belt puts too much tension on the cylinder to permit easy extraction or one-hand reholstering. Steel reinforcement is often an option from a custom maker, standard with the Sparks VM2 (my choice), available from Ryan Grizzle, TT Gunleather and probably others. A 3" barrel is the longest I'd consider for IWB. I have to contort too much to draw a 4".

Any revolver works best in an OWB holster, if you have a suitable cover garment. The best concealment and smoothest extraction is with a pancake holster, preferably with belt loops. The "quick snap" holsters put too much tension on the cylinder.