Be sure & check out Mike Barranti's North West Hunter shoulder holster, it's amazing! Years ago I started out with Lawrence shoulder holsters & also Idaho Leather shoulder rigs & both were very good. I also used Bianchi rigs with very good success. The only problem was they all hung under the arm & with a long barreled sixgun that can be uncomfortable & unhandy at times.
The Barranti NWH rig is adjustable & you can move it around & also carry it across in front of you so the gun is easy & fast to access. They are very comfortable to wear.

This is a muley doe I shot last month on a land owner tag in Utah. Also took a doe antelope wearing the same chest rig.

Dick