The Firing Line Forums - View Single Post - Is Spherical Powder More Sensitive to Hot Climates than Other Powders?

mehavey · December 5, 2012, 09:06 PM

From AR15.com

Several years back Hodgdons did a velocity spread test from 0-125 F on 7.62x51mm using a 168gr OTM bullet. Their data showed the most temperature sensitive powder in their test to be IMR 4895, not a ball powder. Hodgdons data was on their website but has since been removed. I have had no luck in getting Hodgdons to send me their full list of data from their tests. A partial list of the Hodgdons data is below:

Velocity spread in FPS between 0-125 degrees F:

1. H4350: 4 (FPS)
2. Varget: 8
3. H4831C: 10
4. RL 12: 26
5. AA4350: 29
6. AA2460: 36
7. IMR 4064: 46
8. VIT 550: 49
9. RL 15: 50
10. VIT N140: 50
11. AA2520: 63
12. IMR 4350: 67
13. RL22: 75
14. RL 19: 94
15. AA3100: 113
16. W 748: 114
17. VIT N560: 121
18. IMR 4831: 127
19. IMR 4895: 166

December 5, 2012, 09:06 PM	#5
mehavey Senior Member Join Date: June 17, 2010 Location: Virginia Posts: 6,886	From AR15.com Several years back Hodgdons did a velocity spread test from 0-125 F on 7.62x51mm using a 168gr OTM bullet. Their data showed the most temperature sensitive powder in their test to be IMR 4895, not a ball powder. Hodgdons data was on their website but has since been removed. I have had no luck in getting Hodgdons to send me their full list of data from their tests. A partial list of the Hodgdons data is below: Velocity spread in FPS between 0-125 degrees F: 1. H4350: 4 (FPS) 2. Varget: 8 3. H4831C: 10 4. RL 12: 26 5. AA4350: 29 6. AA2460: 36 7. IMR 4064: 46 8. VIT 550: 49 9. RL 15: 50 10. VIT N140: 50 11. AA2520: 63 12. IMR 4350: 67 13. RL22: 75 14. RL 19: 94 15. AA3100: 113 16. W 748: 114 17. VIT N560: 121 18. IMR 4831: 127 19. IMR 4895: 166