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.
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 ...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 ?
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See #30.Thanks for bringing this up. I was unaware of the sensitivity.
Yeah that would be a good test.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.
This!If that's the case, work up a load that's not pushing it to max pressure
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!!!!!Thanks for bringing this up. I was unaware of the sensitivity.
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.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.
Good stuff, thank you for finding thatLook 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.
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!!!!!