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Mixed bag on these. The 125's weren't too bad and the 158's tanked!
Jamison Brass & Ammunition .357 Magnum 125gr JHP (Montana Gold)
Ruger GP100 6" 1348, 1350, 1365. Average = 1354.33 FPS/ 509 LBS
Jamison Brass & Ammunition .357 Magnum 158gr JHC
Ruger GP100 6" 966, 941, 994. Average = 967 FPS/ 328 LBS Smelled pretty horrible and shot like a Cowboy load. Actually one of the weakest .357's ever!