N570 in the cold

[Earnhardt]

We occasionally see -25F and colder up here…when I see that on the forecast, I'll leave some ammo outdoors over night with the RUM or Edge, and I'll try it.

 

[FEENIX]

So I was check VV website and came across this warning from them.
I have never really heard people discuss about pressure from being too cold with N570 has anyone had any experiences with this?
Should a guy steer clear of it living in a cold climate as they suggest ?
View attachment 626454

Interesting; thanks for sharing the info. I have a few lbs of N570 but have not used it yet. When I asked VV for temp stability, here is what I got ...

 

[FEENIX]

Thanks for bringing this up. I was unaware of the sensitivity.

See #30.

 

[Trm82]

We occasionally see -25F and colder up here…when I see that on the forecast, I'll leave some ammo outdoors over night with the RUM or Edge, and I'll try it.

Yeah that would be a good test.

Like how can 570 create that much pressure in "extreme cold " because in my brief experience using it I gained 100 fps over retumbo with what seemed like no pressure signs at all so how can it go the extreme other direction in the cold ?
I'm interested to see your results. Keep us posted !!

 

[Mike Matteson]

Look up VIHTAVUORI N570. It show that it not recomened in -4 deg or lower temps. They point to N568 to use. It appears that it's a double base powder (not quite sure) which would have problems in higher temp also.
I stay with H powders, and don't have that problem in cold or hot weather.
I really feel that the powder manufactors should test all their powder to pressure changes from -30 to 120 degree weather and put it out for everybody to see. Hodgdon does a nice job of rating powders, but not all. I will include their temp chart. It doesn't take much to look it up on the net.

 

[FEENIX]

If that's the case, work up a load that's not pushing it to max pressure

This!

 

[Mike Matteson]

If I remember correctly 50fps changest you poi 14" at a 1000yds. Yes you can input it and make the corrections. If you have the equipment amd time to do so. Targets are one thing, and animals are a different thing.