Generally you will find the SA to have a more refined trigger which is desireable with a hunting firearm. The Blackhawk will feel different from an ergonomic standpoint than your GP100 because it is fitted with a frame and handle of different geometry. Recoil with a .44 will be noticeably different than your .357 but not excessive in a way that it would be uncomfortable. Now shooting a .454 would be a different story. Regarding barrel length, you would be best suited with the Ruger 7.5" barrel but a 5.5" would do.
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