Vhit temperature variation

[AJC1]

Has anyone seen any temperature testing on any of the vhit rifle powders.... based on the form factor of being extruded I figure their as stable as others but curious if any are temperature inverse.... I'm planning my load windows as if they follow traditional increases with temperature.

 

[Bearded Phil]

The in his 70's range officer at my club that shoots revolver competition has told me a few times that vhitavuori powders are next to completely temp insensitive but beyond that anecdote I don't really have any first hand experience with it.

 

[N555]

They claim n555 is the most temp stable in its class. For the price it better be and seems to be.

 

[IMtheNRA]

I chronoed my .223 loads using N133 at various ammunition temperature readings. The result was more velocity at higher temperature, and therefore, different elevation scope inputs at 600 yards. I have no idea how this compares to other powders, as this is the only one that I use in my precision loads and the only one I needed to test.

 

[bigpower491]

I use N150 in the 338-06 exclusively. For the most part, my deer load for it is pretty stable. I don't get much , if really any , change between 25 and 60f. I have not shot any of those loads mid summer, when she's around 80+.
I'm about .3 under max with that load, personally I would probably reduce it by a grain if I was gonna let a few go when she's right hot out and see how it goes, just to be on the safe side

Let me add, it is probably one of the best powders I have ever used in 06 class cases. It is very consistent once you have it dialed in. Tiny spreads and very low deviation. It was worth the 15 extra bux a pound over IMR

 

[AJC1]

I use N150 in the 338-06 exclusively. For the most part, my deer load for it is pretty stable. I don't get much , if really any , change between 25 and 60f. I have not shot any of those loads mid summer, when she's around 80+.
I'm about .3 under max with that load, personally I would probably reduce it by a grain if I was gonna let a few go when she's right hot out and see how it goes, just to be on the safe side

Let me add, it is probably one of the best powders I have ever used in 06 class cases. It is very consistent once you have it dialed in. Tiny spreads and very low deviation. It was worth the 15 extra bux a pound over IMR

I like 135 just fine so far, I wish the got 140 or 150 in because 130 and 133 is a little fast for my liking. That's what's currently on the shelf.

 

[bigpower491]

This is what I call consistency
I shot this group probably 10 yrs ago. The "flyers" to the left were from dialing in a new scope after using my primitive bore sighter. I already had the load close at that point and this was the second group of the day in my final development. I stopped there, at 55.3. The temp was about 45 degrees

Fast forward to last year when I needed to load a few for my trip to Manistee, I pulled out the powder, went to my numbers and got this..
Those were shot on a 60* day.
This load runs a 225gr Hornady at 2650fps. Even after 9 yrs, it was still hitting that ballpark. Reckon I did a good job storing the powder.
I'd call that not bad for a hunting rifle

 

[IALoder]

N140 has been quite stable for me up to about 85°-90° then it starts gaining velocity quickly. I haven't played with N135 enough to really say, but It did have a small velocity change (~15fps) between 50° and 80° for me.

 

[AJC1]

N140 has been quite stable for me up to about 85°-90° then it starts gaining velocity quickly. I haven't played with N135 enough to really say, but It did have a small velocity change (~15fps) between 50° and 80° for me.

That's the area I'm worried about because the summer in the south is hot.... I have considered just shooting other guns to avoid the issue....

 

[Walkalong]

That's the area I'm worried about because the summer in the south is hot.......

Yep

 

[bigpower491]

That's the area I'm worried about because the summer in the south is hot.... I have considered just shooting other guns to avoid the issue....

Just drop back a 1gr or so

 

[Walkalong]

That defeats the purpose