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



Brass Make/Headstamp:  FEDERAL 357 MAG

Bullet Make/Weight/Construction/Info:  Federal 125grs  JHP;
Actual Weight:     124.4grs.;   .3567" dia.;   .549" long;







C.O.A.L.:    1.547"

Primer:  Nickel;  Federal 200?
Case: Nickel;  1.288";  74.8grs. w/o primer



Powder Description/Positive ID/Type/Charge Weight:  Flattened Ball;  19.5grs. 







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.