Jamison Brass & Ammunition. 357 Magnum 125gr JHP (Montana Gold) and 158gr JHC

[Intercooler]

[Intercooler]

 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!