Temperature Sensitivity of Alliant Reloder 26

[fmuguira]

Know this thread covers a couple years of time but what I m wondering and curious of is the temperature sensivity with R26 probably different depending on what node/pressure you re loading to?

Just wonder if anyone has played with that variable. i.e.: maybe if running R26 closer to the middle node which could still be good velocity does it have less sensitivity? Just wondering .....

 

[codyadams]

Know this thread covers a couple years of time but what I m wondering and curious of is the temperature sensivity with R26 probably different depending on what node/pressure you re loading to?

Just wonder if anyone has played with that variable. i.e.: maybe if running R26 closer to the middle node which could still be good velocity does it have less sensitivity? Just wondering .....

I would honestly be suprised if that wasn't a factor in some aspect. I have also wondered if specific cases could cause it to act differently. For instance, in my .260AI, it is a very high load density, and about perfectly balanced with burn rate, energy, and case fill, especially with the 156 Berger. However, when I tried it in my .338 Norma Mag with 265 ABLR's, case fill was very low in comparison. I would be willing to bet that I would get different results from it then I did my .260AI.

Bottom line in my opinion at this point, it is best to test it out yourself in your specific gun under the conditions you plan to use it in, with all powders. I don't really get the hot, 85°+ temps out here, especially during any hunting seasons, so it is a non issue for me, and I personally haven't seen the problem, but fully believe the people that have, it just doesn't apply to my circumstance. If I lived in New Mexico, I very well may be using a different powder.

 

[moosekiller99]

The load density variable may bear further looking into 47.3 is my middle node of 26 in my 6.5 CM. Shot at 84 F 2 weeks ago with no signs of pressure. This load and the 47.8 load were both developed at 34 F. At 600 yards it had same POI so It appears not to have much if any velocity increase over a 50 degree swing in temperature. I suppose a velocity check would be in order if it gets in the 80's next week.

 

[brentc]

After burning dozens of pounds of this powder from sub zero temps in AK, to 100°+ in El Paso, TX since it came out, I have learned that temp sensitivity is something I don't waste time worrying about with RL26.

Those that say it goes crazy above 85° are definitely doing something different than I am. I just haven't seen the weird pressure spikes that people speak of. I load in the middle of the accuracy nodes observed through load development using either OCW or ladder methods.

 

[Sako284]

After burning dozens of pounds of this powder from sub zero temps in AK, to 100°+ in El Paso, TX since it came out, I have learned that temp sensitivity is something I don't waste time worrying about with RL26.

Those that say it goes crazy above 85° are definitely doing something different than I am. I just haven't seen the weird pressure spikes that people speak of. I load in the middle of the accuracy nodes observed through testing by by either OCW or ladder.

+1 with these findings.

 

[venatic]

+2

 

[Tidus56]

Same, I have used it from below freezing to 100 degrees and the difference isn't enough to worry about unless you're on the ragged edge of pressure already.

 

[coop2564]

Same for me. I think many just say what they heard not from experience with it. It does increase slightly with temperature but not much more than retumbo. In my 6.5 cm 70* 2847 90* 2873