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From a 6"bbl average velocity is: 1305fps!
Caliber: 357 Magnum
Bullet: 200gr. Wide Flat Nose Gas Check Hardcast
Velocity: 1200fps / 4" Ruger GP-100
1315fps / 6"bbl S&W 686
Muzzle Energy: 640 ft. lbs.
563 ft lbs at 50yds from a 4" bbl.

Hi Ben and welcome. Product details from 4 inch revolver and 6 inch revolver here : https://doubletapammo.com/products/357-mag-200gr-hardcast-solid-a-20rds --------------- a 5 inch barrel would be 1250 fps and around 600 ft-lbs at the muzzle. Cheers and stay safe!