Is H-335 a Temperature Sensitive Powder????

[gth]

I read on another board about guys having problems with h-335 due to its temperature sensitivity.

Is this true?? Is it any more sensitive to temperature than any other powder???

I have a good .222 and a good .308 load with h-335 and i have never experienced this sensitivity to temperatuer.

 

[Hitzy]

All the hodgdon ball powder is temp sensitive. Just means you can lose up to a couple hundred FPS from the hottest summer day you go shooting to the coldest winter day. Have you chrony'd it in both extremes? Shooting at 100m you probably won't notice any difference.

 

[gth]

No I havent chronied it or tested it at the extreme temperatures. Just wondering.


I have thought of switching to h-4198 just because its one of the "Extreme" powders thats apparently not temperature sensitive. I really havent noticed enough variance in my loads to be concerned, just toying with the Idea.

 

[PEI ROB]

Varget would be a better choice IMO.

 

[blindside]

In general cylindrical powders are less temp sensitive than ball...Hogdons tech tells me when testing high velocity 22/250 loads there was as much as 320 fps difference with H380, and only 40 fps diff. with varget..Both powders tested over the same temp range

 

[Janeau]

I do not believe that Hogdon powder is more sensitive than any other powder from other makers.
There is now new powder who produce less velocity difference in cold or extremely hot situation.
But keep the round in your pocket until you are ready to shoot and you should worry more about your gun barrel to be really cold and contracted ( tighter) than the powder.

What you want is proper ignition in really cold weather. If -25/-40 C use a magnum primer.
I use H335 extensively to hunt coyote, and cold weather was never a factor to make me see a difference in hunting accuracy or performance.

 

[blindside]

[quote="Janeau
There is now new powder who produce less velocity difference in cold or extremely hot situation.
[/quote]

:roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :?:

 

[gth]

[quote="Janeau
There is now new powder who produce less velocity difference in cold or extremely hot situation.


:roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :?:

I dont think they so much tried to make the powder that as they found that some of thier extruded powder that were created using a certain process turned out to be less sensitive to temperature. So like any good business they went back and tried it on their other extruded powders and got similar results.

Q. What is "Extreme Technology?

A. When we introduced Varget, we discovered that it was extraordinarily stable in performance when the operating temperature changed. We investigated this property and found it to be true. We then went back to each of our extruded powders and incorporated this same technology into them

 

[blindside]

Thats the long and short of what I was told on the phone. Extruded is less temp sensitive

 

[Janeau]

They acknowledge that they ran into that property by luck !!
Read by new powders..the lastest introduced ( 90's+).
So they are saying that even old powders, introduced in the 70's, 80's are not exactly the same as they were back then...

Anyway, this is academic, since most hunter will never have a problem and see any difference that really matter.

I use H335 extensively in .223 and 22.250 and I never dreamed of blaming a miss on the cold powder properties of the powder .... :roll:

 

[Eagleye]

Several years ago, When this temperature-sensitivity issue was making the rounds, I did some independent testing with3 rifles and my Chronograph. I used a 6mm Remington/100 grain Hornady; a 30-06/165 Hornady; And tha 308 Norma Mag/180 Hornady. The powders I tried were; W760, IMR 4350 and Norma MRP. Of the three, The MRP was the least sensitive, changing only about 35 fps from +75ºF to -20ºF [+ 22ºC to - 28ºC] the IMR 4350 changed about 100fps in that range and the W760 about 125fps. Point of impact changed on the 760 loads about 1" at 300 meters. Whoopde-doo!! Not enough to cause a miss on any big game animal, but I suppose if one were varminting, and took a long poke at Wile-E Coyote, you might miss low. I would hazard a guess that there have been some powders all along that have shown more temp sensitivity than others, but until it was touted by Hodgdon, most of the shooting fraternity ignored it or made compensation when shooting in extremely cold temps. I have hunted at -40ºC and shot game without any problems [except the effect the cold had on ME!!] However, some feel more confident, knowing that their loads will be similare in performance, hot or cold, and that is fine. I just think that sometimes we tend to make too much out of minor issues. If you have a hotdog load developed with a so-called temp-sensitive powder, I would not bother to discard it simply for that reason. JMHO, Eagleye.

 

[gth]

IMR 4350 changed about 100fps in that range and the W760 about 125fps. Point of impact changed on the 760 loads about 1" at 300 meters. Whoopde-doo!! Not enough to cause a miss on any big game animal

I'm no ballistics expert....... :?

125 fps will only account for 1" at 100yds........... :?: :?: At 100ds the change would be next to nothing. I would have thought it would be a lot more.

If you have a hotdog load developed with a so-called temp-sensitive powder, I would not bother to discard it simply for that reason. JMHO, Eagleye

I didnt have any plans of chucking my current loads out the window, but I had thought of trying some new powders for the .222 .22-250 and .243 because I picked up a boat load of new bullets I havent loaded before.



Good info......thanks.

 

[Janeau]

gth,

Not because of temperature sensitivity, but of because of reported exceptional accuracy, I am trying AA2460 in my .223 and 22.250
That powder meter very easily. Just loaded some with Barne 50 grains VLC bullet.