357 Mag Winchester 125gr JHP Super X

[RDub01]

Cartridge is from Ammo Manufacture:  Winchester .357 Mag
                                                                   
Muzzle Velocity; Advertised:   1450 fps
Muzzle Energy; Advertised:   583  ft/lbs

Actual Instrumental Velocity:  1366 fps; 4" 686; 44°F
Target dot 4"



Brass Make/Headstamp:  Winchester 357 MAG

Bullet Make/Weight/Construction/Info:  Winchester 125gr JHP; .3567" dia;  .545" long.
Actual Weight:  124.4grs.







C.O.A.L.:    1.563"

Primer:   Brass color; Winchester WSPM
Case:  Nickel

Powder Description/Positive ID/Type/Charge Weight:  Flattened Ball;  19.8grs.







I got one low reading on the chrono.  The average should be a bit higher had this not occurred. The bad round went low and right.

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 Winchester ammo.  Same day, close to the same temperature.



Shot another group today, 2-6-19..  Not much difference in Sd, but better..  Velocity reflects a colder day.

[RDub01]

Shot another group today..  See original post.