(https://i.postimg.cc/j5vsh6Y3/DSC02725-sized.jpg) (https://postimages.org/)
Cartridge is from Ammo Manufacture: Federal .357 Mag
Muzzle Velocity; Advertised: 1440 fps (No barrel length mentioned)
Muzzle Energy; Advertised: 575 ft/lbs
Actual Instrumental Velocity 1246 fps; 4" 686; 44°F
(https://i.postimg.cc/KzLq9nz2/DSC02781-sized.jpg) (https://postimages.org/)
Brass Make/Headstamp: FEDERAL 357 MAG
Bullet Make/Weight/Construction/Info: Federal 125grs JHP;
Actual Weight: 124.4grs.; .3567" dia.; .549" long;
(https://i.postimg.cc/L6Gmv6GS/DSC02729-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/v8qYgvzc/DSC02731-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/1589pNCM/DSC02733-sized.jpg) (https://postimages.org/)
C.O.A.L.: 1.547"
Primer: Nickel; Federal 200?
Case: Nickel; 1.288"; 74.8grs. w/o primer
(https://i.postimg.cc/dVdwfcKy/DSC02730-sized.jpg) (https://postimages.org/)
Powder Description/Positive ID/Type/Charge Weight: Flattened Ball; 19.5grs.
(https://i.postimg.cc/Xqz4RVJw/DSC02727-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/YSzkpN02/DSC02726-sized.jpg) (https://postimages.org/)
(https://i.postimg.cc/43gsk2JF/DSC02728-sized.jpg) (https://postimages.org/)
After seeing 19.5grs of a ball powder in this ammo, I loaded up some Winchester 125gr JHP, 19.8grs of 296 and a Fed 200 primer. I only got 1167 fps out of the 4" 686. This was shot right after testing this Federal ammo. Same day, close to the same temperature.
(https://i.postimg.cc/R0xJ94FB/125gr-Win-JHP-1-31-19-19-8gr-296.jpg) (https://postimages.org/)