You may have noticed in a prior post with pics that my sako 22/250 does amazingly well with 38.5 grs of H380 and a sierra 52 gr matchking,but I'm told that h380 goes to the dogs in the cold,and I should switch to varget before temp drop.The coldest I could see myself out around here is -15.I would appreciate opinions,cause man oh man,I hate to switch loads when things are going so well.Thanks.

I thought H380 is one of Hogdon's Extreme Powders? (Temperature-insensitive)

I like the less temperature sensitive powders because of the extremes we have here in Texas. For your 22-250, Varget and R-15 will both do very well. I am working up a load with Ramshot Big Game right now. It is supposedly not as temperature sensitive and is a ball powder so it meters as well and the H-380......

Good Hunting,

Bob

I have loaded 22-250 shells in 100deg Okla summers and took them p dog hunting in 30-40deg Wyoming falls and they always worked great for me. I have used H380 in hunting rifle loads that were loaded under the same conditions and the hunting temp was below zero. They worked fine. I also have only used standard primers for my H380 reloads and they always have gone bang.
I kinda think this "temp insensitive" thing is more a marketing ploy than anything else.
H380 has been around too long and worked well in too many loads/rifles to suddenly be worthless.

Thanks for the help lads,but as they say its in the pudding,so goin to put some into the freezer for an hour,transfer to mini cooler beside ice pacs,go to the range,pull them out one by one and shoot group.If theres very little to no change,then that will put an amen to that.

When I used H380, I didn't get a difference in accuracy. What I did get was a shift in Point Of Impact from season to season. I then switched to Varget and got better accuracy and my POI stayed the same throughout the different seasons.
I did read an article on these temperature insensitive powders(I think in Percision Shooting or something like that)and according to the article it did make a difference. Don't quote me on this but it was something like this: they tested temp. insensitive against non temp. insensitive between -50*F and 120*F. The Hodgdon temp. insensitve powder avg. a 10fps and the non-temp. insensitive avg. somewhere around 100fps difference. Reloader powder was a close second. Hope this helps.slygunner