Temperature sensitive powder?

Eaglet · #22 12-13-2007, 11:10 PM

Victor,

That makes sence to me.

goosepit · #23 03-07-2011, 08:39 AM

[QUOTE=specweldtom;170462]JECustom and I have both heard that the Reloader powders are very temperature sensitive. I have a good load in .280 Rem with Reloader 22. Should I be looking for another powder?

found this old thread about tempture sensitive powders and thought this might help fellow members out,this is from hodgdon web site.

CARTRIDGE: 30-06 • CASE: W-W
PRIMER: WLR • BULLET: 165 gr. Hornady SP

POWDER
H4350
RELODER 19
IMR 4350
VIT N550
AA 4350

Pressure 70 Deg. F

47,300 CUP

47,200 CUP

51,400 CUP

50,100 CUP

47,100 CUP

Pressure 125 Deg. F

47,800 CUP

50,900 CUP

60,200 CUP

45,100 CUP

Pressure 0 Deg. F

48,000 CUP

48,900 CUP

51,700 CUP

47,600 CUP

51,900 CUP

Velocity 70 Deg. F

2881 f/s

2820 f/s

2908 f/s

2883 f/s

2786 f/s

Velocity 125 Deg. F

2880 f/s

2902 f/s

2941 f/s

2927 f/s

2772 f/s

Velocity 0 Deg. F

2884 f/s

2808 f/s

2874 f/s

2878 f/s

2801 f/s

Pressure Variation (Hot)

+500 CUP

+600 CUP

-500 CUP

+10,100 CUP

-2,000 CUP

Pressure Variation (Cold)

+700 CUP

+1,700 CUP

+300 CUP

-2,500 CUP

+4,800 CUP

Velocity Variation (Hot)

-1 f/s

+82 f/s

+33 f/s

+44 f/s

-14 f/s

Velocity Variation (Cold)

+3 f/s

-12 f/s

-34 f/s

-5 f/s

+15 f/s

Extreme Pressure Spread

700 CUP

1,700 CUP

800 CUP

12,600 CUP

6,800 CUP

Extreme Velocity Spread

4 f/s

94 f/s

67 f/s

49 f/s

29 f/s

CARTRIDGE: 300 Win. Mag. • CASE: W-W
PRIMER: WLRM • BULLET: 180 gr. Sierra Boat Tail SP

POWDER
H4831SC
AA 3100
IMR 4831
VIT N560
RELODER 22

Pressure 70 Deg. F

54,000 CUP

51,800 CUP

51,000 CUP

52,400 CUP

53,000 CUP

Pressure 125 Deg. F

52,800 CUP

54,300 CUP

54,400 CUP

57,000 CUP

55,100 CUP

Pressure 0 Deg. F

53,200 CUP

51,500 CUP

49,400 CUP

51,800 CUP

52,700 CUP

Velocity 70 Deg. F

2985 f/s

3050 f/s

3012 f/s

3009 f/s

3087 f/s

Velocity 125 Deg. F

2995 f/s

3113 f/s

3080 f/s

3101 f/s

3142 f/s

Velocity 0 Deg. F

2986 f/s

3000 f/s

2953 f/s

2980 f/s

3067 f/s

Pressure Variation (Hot)

-1,200 CUP

+2,500 CUP

+3,400 CUP

+4,600 CUP

+2,100 CUP

Pressure Variation (Cold)

-800 CUP

-300 CUP

-1,600 CUP

-600 CUP

-300 CUP

Velocity Variation (Hot)

+10 f/s

+63 f/s

+68 f/s

+92 f/s

+55 f/s

Velocity Variation (Cold)

+1 f/s

-50 f/s

-59 f/s

-29 f/s

-20 f/s

Extreme Pressure Spread

1,200 CUP

2,800 CUP

5,000 CUP

5,200 CUP

2,400 CUP

Extreme Velocity Spread

10 f/s

113 f/s

127 f/s

121 f/s

75 f/s

CARTRIDGE: 308 Win. • CASE: W-W
PRIMER: WLR • BULLET: 168 gr. Sierra BTHP

POWDER
VARGET
WIN. 748
RELODER 15
VIT N140
IMR 4064
AA 2520

Pressure 70 Deg. F

51,100 CUP

50,200 CUP

50,300 CUP

49,600 CUP

51,100 CUP

49,900 CUP

Pressure 125 Deg. F

51,500 CUP

51,100 CUP

47,300 CUP

51,000 CUP

49,700 CUP

52,600 CUP

Pressure 0 Deg. F

51,200 CUP

47,300 CUP

48,700 CUP

47,500 CUP

51,300 CUP

50,500 CUP

Velocity 70 Deg. F

2771 f/s

2724 f/s

2715 f/s

2665 f/s

2686 f/s

2805 f/s

Velocity 125 Deg. F

2779 f/s

2769 f/s

2705 f/s

2679 f/s

2697 f/s

2844 f/s

Velocity 0 Deg. F

2778 f/s

2655 f/s

2665 f/s

2629 f/s

2651 f/s

2781 f/s

Pressure Variation (Hot)

+400 CUP

+900 CUP

-3,000 CUP

+1,400 CUP

-1,400 CUP

+2,700 CUP

Pressure Variation (Cold)

+100 CUP

-2,900 CUP

-1,600 CUP

-2,100 CUP

+200 CUP

+600 CUP

Velocity Variation (Hot)

+8 f/s

+45 f/s

-10 f/s

+14 f/s

+11 f/s

+39 f/s

Velocity Variation (Cold)

+7 f/s

-69 f/s

-50 f/s

-36 f/s

-35 f/s

24 f/s

Extreme Pressure Spread

400 CUP

3,800 CUP

3,000 CUP

3,500 CUP

1,600 CUP

2,700 CUP

Extreme Velocity Spread

8 f/s

114 f/s

50 f/s

46 f/s

63 f/s

CARTRIDGE: 22-250 Rem. • CASE: W-W
PRIMER: WLR • BULLET: 55 gr. Speed FMJ-BT

POWDER
H4895
VIT N140
RELODER 12
AA 2460
IMR 4895

Pressure 70 Deg. F

49,500 CUP

48,700 CUP

51,700 CUP

50,000 CUP

48,100 CUP

Pressure 125 Deg. F

48,700 CUP

50,500 CUP

49,400 CUP

54,100 CUP

52,300 CUP

Pressure 0 Deg. F

49,700 CUP

46,800 CUP

51,900 CUP

48,700 CUP

48,000 CUP

Velocity 70 Deg. F

3742 f/s

3662 f/s

3607 f/s

3671 f/s

3699 f/s

Velocity 125 Deg. F

3748 f/s

3692 f/s

3609 f/s

3707 f/s

3791 f/s

Velocity 0 Deg. F

3728 f/s

3611 f/s

3633 f/s

3673 f/s

3625 f/s

Pressure Variation (Hot)

-800 CUP

+1,800 CUP

-1,700 CUP

+4,100 CUP

+4,200 CUP

Pressure Variation (Cold)

+200 CUP

-1,900 CUP

+200 CUP

-1,300 CUP

-100 CUP

Velocity Variation (Hot)

+6 f/s

+30 f/s

+2 f/s

+36 f/s

+92 f/s

Velocity Variation (Cold)

-14 f/s

-51 f/s

+26 f/s

+2 f/s

-74 f/s

Extreme Pressure Spread

1,000 CUP

3,700 CUP

1,900 CUP

5,400 CUP

4,300 CUP

Extreme Velocity Spread

20 f/s

81 f/s

26 f/s

36 f/s

166 f/s

BACK | FORWARD

J E Custom · #24 03-07-2011, 09:11 AM

[QUOTE=goosepit;484091][QUOTE=specweldtom;170462]JECustom and I have both heard that the Reloader powders are very temperature sensitive. I have a good load in .280 Rem with Reloader 22. Should I be looking for another powder?

I see no reason to rush out and change powders if you have a good load and are aware of the
temp changes in your range of temperatures.

High temps seem to be the culprit and it should be of concern if you shoot at the higher temps
(90o+)

Sense Hodgdon came out with there extreme line of powders I have tried to convert to them
with very good results except for a few that like other powders better. and on those I just have
to watch the temp when I use them (One load will increase 150 ft/sec from 30o to 100o).

J E CUSTOM

Onager · #25 03-07-2011, 12:25 PM

No where near the experience you guys have but here is my experience with RL22 and two 300 RUM
My brother and nephew asked me to work up the a load that would work in both Remington 700s using this powder. They also hoped I could find the same load that was interchangable in both guns. Riiiiiight.
Surprisingly, much easier than I thought. One is a standard 700 in a glass bedded laminated stock. The other is a heavy fluted barrel in a expensive pillar bedded synthetic stock. Barrels broken in on both. Each of the guns supposedly hated factory ammo.
I used 180 gr Barnes TTsx bullets. I found that 87 grains of Rl 22 gave the best accuracy. I avoided pushing the load over 87.5 grains because, of the temp. sensitivity fear and they aren't my guns.
Fired all groups at 300 yards.
The one day the temp was in the 80s and I had "cooked" the rounds in my car all day. Can't remember the velocity average at the moment. Groups were 0.5 moa(great for me). No pressure signs but velocity was a bit higher than my goal.
This winter I completed the project. Temperatures were in the 30s to high of 40 degrees F.
Excellent groups again but the one group poi was 3 1/2 inches lower in the cooler weather. No horizontal deviation. The velocities averaged 150 fps less. In my brothers gun the poi was 3 inches lower in the cooler weather. With an average loss in velocity of 125 fps.
They are happy that the 87 grains works in both guns and they got much better accuracy.
My take away is that "pressure sensitive" powders can/do give good accuracy but I will not push the velocity to the upper limits.

rscott5028 · #26 03-07-2011, 05:44 PM

I agree with JE that you don't necessarily need to change if you already have a good load that meets your needs.

The key to success would be to get dope on your rifle/load under the conditions that best represent what you'll experience when hunting.

I have a small sample of data from my own rifles that seems to corrobrate Hodgdon's claims. And, I plan to stick with h4831sc in my 6.5x284 12F rifle.

But, RL22 is still good enough for much of the hunting that I do.

--richard

nheninge · #27 03-08-2011, 09:20 AM

About a year ago or so on this site, there was a post in a thread listing powder sensitivity in order from most to least. Not sure what tests it was based on, but I can't seem to find it now. Anybody remember where that is? Seems relevant to the discussion at hand.