Temperature sensitive.

[old sparky]

I have always heard about temp. sensitive powder and have never had a example. I loaded up some H380 in a 7mm08 1 grain over starting and 3 grains under max in a few books the load was the starting load. I shot these last week temperatures around 110+ I noticed slight cratered primers. Do you think this may be temperature related? This isn't my powder of choice but it was all I had available with the powder shortage. I have loaded H380 in a 22-250 for the past 15 years but I shoot it in the winter months. Does this sound like a temperature problem?
thanks, Sparky

[girl from PHX]

My HP rifle load are deffinately heat sensitive. I basically shoot a 7mm (.308 Sav case necked down) with 36.5 gr of 2520. This particular powder has always been heat sensitive.....even when I lived in central California. Sometimes have to utilize a small ice chest (with a very small ice pack) to keep things from getting out of hand here in PHX.

[Bob Mc Alice]

I tried some H380 in my 7-08's a long time ago. Poor choice for the rifles I tested it in. Terrible accuracy, narrow spread of recomended charge weights. Impossible to load mildly without hangfires, needed magnum primers for uniform ignition. I quickly abandoned using it. Some others I use for my 7-08's are I4064, I4895, I4320, Reloader 15 and H4831 for heavier bullets. But by far Varget is perhaps THE best propellent for the 7-08. Wide spread of useful charge weights, not temperture sensitive, fantastic accuracy in all my rifles.

Powders are starting to show up in volume in my area. Try a pound of Varget....you wont be dissapointed.

[Jim Beckley]

Was there anyother signs of high pressure? Sticky bolt, extractor mark on case? Usually a ball powder is not the best choice in the summer time here. A few years ago when everyone was still shooting a .308, someone tried a load with WW-748 and it shot really well in the fall and winter, but when early spring came around and the temps came up, that powder was quickly by the way side. You might try one of the H-Extreme powders, even Varget like McAlice suggested!

[old sparky]

I beleive I did have a pressure problem. A couple times the bolt was stiff. H380 isnt my choice I just thought I would try it since I had it. I figured I would be ok with a low charge weight. Still keeping my eyes open for powder to come in.
thanks all.

[Jim Beckley]

There are a few who might say that primers are sometimes soft, and not to worry too much about that, but just remember that it is your face behind that bolt when the gun goes off. Primers with crater, sticky bolt not too many good things going to come of that.

[old sparky]

I don't plan to shoot anymore H380 in summer months. I have been looking through web sites nightly to find powder. Midsouth had some Varget on there sight last night. I ordered 8lbs and it says it shipped. I have never been one to hotrod reloads if I needed more velocity I would choose a diferent cartridge. And I am very conservitive about safety.
Thanks, for the help, Sparky