(https://i.postimg.cc/K8Wrq8VP/DSC03000-sized.jpg) (https://postimages.org/)
Cartridge is from Ammo Manufacture: Federal .357 Mag
Muzzle Velocity; Advertised: 1240 fps (No barrel length mentioned)
Actual Instrumental Velocity 1268 fps; 5" 686-6; 68°F 10' from muzzle
Muzzle Energy; Advertised: 539 ft/lbs
(https://i.postimg.cc/yxynhFWs/DSC03014-sized.jpg) (https://postimg.cc/XBXw4Bwz)
Brass Make/Headstamp: FEDERAL 357 MAGNUM
Bullet Make/Weight/Construction/Info: Federal 158grs JHP;
Actual Weight: 158.8grs.; .3567" dia.; .668" long;
(https://i.postimg.cc/yxn0F1cS/DSC03005-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/Fzhjddd4/DSC03007-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/SsFL4tmj/DSC03008-sized.jpg) (https://postimages.org/)
C.O.A.L.: 1.560"
Primer: Nickel; Federal 200?
Case: Nickel; 1.285"; 78.5grs. w/primer; Base .3758"
(https://i.postimg.cc/Cx3D1RLN/DSC03006-sized.jpg) (https://postimages.org/)
Powder Description/Positive ID/Type/Charge Weight: Flattened Ball; 16.5grs.
(https://i.postimg.cc/3RXXxCw1/DSC03002-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/Nff6QXv8/DSC03001-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/L4VkdTw6/DSC03004-sized.jpg) (https://postimages.org/)
Interesting.. The big three, Rem, Win, and Fed all load their respective 158gr Jacketed rounds with 16.5grs. of a flattened ball powder.
Looks like H-110 / W 296 Hodgdon shows Hornady 158 XTP a max of 16.7 grains for those but their test barrel is 10" and showing 1591 fps 40,700 CUP.