Go with the 357 Magnum. A 686 S&W or one of the custom shop ones. You will get a better trigger pull with the Smith over the Ruger GP-100. If I am correct. the locktimes of the double action when used in SA mode is faster than most SA locktimes. Shooting a 357 magnum at 100 yards (I use scopes) is relatively easy. Every 50 yards it becomes more challenging, as wind begins to play a significant part. 357 Mag is flatter shooting than the 44 and less recoil.