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.
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N570 in the cold
- Thread starter Trm82
- Start date
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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 ...
See #30.
Trm82
Well-Known Member
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
Well-Known Member
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.
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.
This!
Mike Matteson
Well-Known Member
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.
Rifleman97
Well-Known Member
- Joined
- Dec 28, 2017
- Messages
- 398
I've ran n570 in roughly -25° temps. Didn't have any issues, lower velocity but nothing I could notice. And I run my reloads pretty hot. So hot I don't really do shooting of my handloads above 45°f where I do my load testing (since I'll probably never hunt somewhere that's warm during hunting season)
I've had one sticky ejector at -10 but I chalked that up to a bad piece of brass, as I did not weigh my casings at that time.
I've had one sticky ejector at -10 but I chalked that up to a bad piece of brass, as I did not weigh my casings at that time.
Michael Lares
Well-Known Member
Only thing I'm hunting that cold are wolves. Keep cartridges in pocket. Checking with heat gun they run about 50* for me. That's the temps I load for year round up here. You do have to be pretty quick loading the gun!!!!!
Mike Matteson
Well-Known Member
Theres a lot of things that come into play. I use to scale weigh my cases. I have changed to volume weigh my case or going to now. I did a lot of reading on checking cases. Determine that case weigh doesn't really do what I wanted. I began in the late 90 to weighting my by scale. A few years ago I finally got it thru my thick head I was using the case weigh wrong. I further read that the top line brass takes care of that problem. I haven't tested that info yet, but going to.
There sure is a lot info that comes up here, some of it good and some is wrong or bad.
nubraskan
Active Member
Good stuff, thank you for finding that
