SSK 338 Whisper

[JayHHI6818]

Purchased a 14 inch SSK Contender barrel chambered in 338 Whisper (7 BR cased necked up to 338).

Got around to loading up some ammo. Hornady 250 gr SP & 285 gr HPBT. Can't find any Sierra 300 gr HPBT's

 

[jonbearman]

I would imagine it is around the same ballistics as the .300 whisper.

 

[JayHHI6818]

Yes

Range Velocity Energy Momentum Drop Bullet Path Wind Drift Time of Flight
(Yards) (Ft/Sec) (Ft/Lbs) (Lb-Sec) (inches) (inches) (inches) (Seconds)
0 1050.0 734.3 1.40 0.0 -1.0 0.0 0.000000000
50 1033.9 711.9 1.38 -3.98 11.68 0.2 0.143977903
100 1018.8 691.3 1.36 -16.09 16.24 0.78 0.290147388
150 1004.6 672.1 1.34 -36.57 12.42 1.74 0.438440348
200 991.1 654.2 1.32 -65.65 0.0 3.06 0.588796785
250 978.4 637.5 1.30 -103.59 -21.27 4.73 0.741163785
300 966.3 621.9 1.29 -150.6 -51.62 6.75 0.895494666
350 954.7 607.1 1.27 -206.93 -91.28 9.11 1.051748271
400 943.7 593.1 1.26 -272.79 -140.48 11.8 1.209888373
450 933.1 579.9 1.24 -348.43 -199.46 14.81 1.369883171
500 923.0 567.4 1.23 -434.06 -268.43 18.15 1.531704862

 

[4xforfun]

Why such a long OAL?? With the bullet seated deeper in the case you further lessen case capasity, making lower FPS easier.

Just asking.....This is the first thing I am going to do IF I ever take the plunge into suppressorvill!!

 

[JayHHI6818]

Sub sonic load data using HP 38 powder. Small powder charge only uses maybe a 1/4 of case capacity

200 Bal. Tip HP 38 9.5gr. 1164 FPS
200 Bal. Tip HP 38 8.8gr. 1077
200 Bal. Tip HP 38 8.6gr. 1060


250 HP 38 8.4gr. 909 FPS
250 HP 38 9.2gr. 991
250 HP 38 9.6gr. 1029
300 HP 38 9.6gr 895
300 HP 38 10.4gr. 1001
300 HP 38 10.7gr. 1011
300 HP38 1O.8gr. 1050

 

[4xforfun]

Sub sonic load data using HP 38 powder. Small powder charge only uses maybe a 1/4 of case capacity

200 Bal. Tip HP 38 9.5gr. 1164 FPS
200 Bal. Tip HP 38 8.8gr. 1077
200 Bal. Tip HP 38 8.6gr. 1060


250 HP 38 8.4gr. 909 FPS
250 HP 38 9.2gr. 991
250 HP 38 9.6gr. 1029
300 HP 38 9.6gr 895
300 HP 38 10.4gr. 1001
300 HP 38 10.7gr. 1011
300 HP38 1O.8gr. 1050

"small powder charge only uses maybe a 1/4 of case capacity"

My point exactly. You may be better off with the bullet taking up a bunch of that capacity. In fact, I have heard of guys loading their bullits BACKWARDS in the case to use up space. 25% load density could be dangerous with some powder/case combos.