Sub-Sonic Loads

03/26/04

Home
Up one level
SSK's Whispers®
300 Whisper Brass
Sub-Sonic Loads
Super-Sonic Loads
Sample Weapons
300 Whisper Links
Whisper on EBAY

 

NEW: 300 Whisper Forums!

After considerable frustration on my part, I have finally managed to get a new forum up and running. The forum includes two areas, one for area for 300 Whisper rifles and pistols and a second for reloading and ammo issues. I have a huge number of visitors that come to these pages each day so please drop in the forum and say "Hi" and share your projects!

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

Click HERE to go to SSK Industries

300 WHISPER® DATA (Sub-sonic)

(.221 REMINGTON FIRE BALL PARENT CASE)

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

 

Powder Charge Grains

Bullet Grains

Average FPS/FPE

Extreme Spread (Velocity)

Standard Deviation

Notes

ACCURATE ARMS No. 5 POWDER

7.54

220

1045/534

24

9

 

7.96

250

1044/605

43

17

 

ACCURATE ARMS No. 7 POWDER

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 No. 1680 POWDER

10.30

220

1023/511

33

15

 

10.30

250

1013/570

44

20

 

11.40

250

1147/731

13

4

 

ACCURATE ARMS No. 2015 POWDER

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 POWDER

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 POWDER

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