As for as leather holsters to fit the 5" S&W 686 plus (7 shot), the Bianchi 5bhl is a near perfect fit in a hard to find size. Model number is 18492. Expect one half inch play with the gun in the holster, but avoids the tight thumbstrap issues as mentioned in other reviews. Cost $65, Try OpticsPlanet amongst others.

My first time out with my 357 magnum I used the Talo laminated wood grip. Hard on the hand with full loads.
I have already received and installed replacement grips.
I went with the Hogue Monogrip conversion (K/L frame size).
Immediate improvement and only $21!
Absorbs recoil nicely, improves grip, all from a black rubber compound grip found on other similar S&W's.
Yes, this is a round butt frame.
Weight for this solid stainless steel beauty is about 39.6 ounces.

The balance of the 5" barrel is perfect, this was my way to resolve the ongoing question of 4" vs. 6" barrel.
Oh, did I mention the 7 round chamber?
Accurate, good trigger and a handsome firearm.
Cost new is about $750.

Highly recommended.