Retrieved: 12/19/2014
Last Post: 03/07/06

Note: The material on this page was provided by J.D. Jones of SSK Industries and he has given permission for its use.

300 WHISPER DATA (Sub-sonic)

(.221 REMINGTON FIRE BALL PARENT CASE)

REM. 7-1/2 PRIMER, 16.5-INCH BARREL, 70 deg. F

 
                     Powder    Bullet   Average   Extreme    Standard   Notes
                     Charge    Grains   FPS/FPE   Spread     Deviation
                     Grains                      (Velocity)


ACCURATE ARMS No. 5  7.54      220      1045/534   24        9
                     7.96      250      1044/605   43        17

 
ACCURATE ARMS No. 7  10.45     220      976/465    38        19
                     10.82     220      1055/544   49        17
                     11.00     220      1071/560   48        19
                     10.45     250      1012/569   73        28

 
ACCURATE ARMS 1680   10.30     220      1023/511   33        15
                     10.30     250      1013/570   44        20
                     11.40     250      1147/731   13        4

 
ACCURATE ARMS  2015  12.64     165      1046/401   63        35
                     12.00     200      1007/450   20        10
                     12.36     220      1073/563   27        10
                     12.00     220      1046/535   30        11

 
ACCURATE ARMS No. 9  8.08      165      1033/391   52        23
                     8.54      220      1013/501   71        27
                     8.78      220      1071/560   28        14
                     8.78      250      1040/601   36        12
                     8.54      250      1005/561   25        11

 
HODGDON H110 POWDER  9.10      220      1061/500   39        15
                     8.65      220      1003/492   84        13
                     8.90      220      1012/500   27        -
                     9.10      220      1061/550   37        17
                     8.60      250      980/533    15        6
                     8.90      250      1052/615   41        15

 
HERCULES 2400        8.26      168      1103/454   30        11
                     7.90      168      1068/426   30        12
                     8.26      190      1062/476   21        8
                     8.58      250      1040/601   50        18
                     8.26      250      994/549    60        22
                     
HODGDON H4227 POWDER 9.20      220      1006/495   89        33
                     9.20      250      1011/568   89        24
                     9.30      250      1039/599   116       44
                     9.40      250      1027/586   135       35

 
HODGDON H335 POWDER  13.86     220      1031/519   54        20

Note: 250 grain bullets are no longer in production. The 240 Sierra Match king replaces it. Two decimal charge weights were obtained using an electronic scale by averaging ten dropped charges.

Important Notes from JD Jones himself:

I would appreciate it if you would delete the Accurate #2 data and say that in SSK AR-15 and M-16 no powder faster burning than Accurate #9 should be used. The gas system is timed for sub sonic with powders with burning rates from #9 through 1680.

Dies from SSK take the 221 from 22 to 30 in one pass for complete forming. When a neck goes up in diameter the neck wall gets thinner--not thicker. Shortening 223 and necking to 30 may give the thick neck problem. Since Redding had ZERO contact with us about this cartridge and dimensions of the Counterfeiters aren't correct we hear from some individuals having problems-- read again the military brass problem. SSK usually has properly made military 300 Whisper brass at far cheaper prices that you can make it if you value your time at all.

Go to 300Whisper.com
This page was last updated 03/07/06