In SSM July/Aug 2016, on pg 64, a well known ballistics expert says that it is chamber pressure that controls cold weather ignition consistency.
6200 is too low for reliability.
Could be, all I know is the load I use has been thru 2 ND winters with no problems. One thing that someone suggested is to put disposable hand warmers with your shells and rotate shells between them and the ones in your gun. This will keep the shells fairly warm to avoid any problems. Good idea, but to be honest I never used this method, does make sense.
BTW, my loads have been tested by Tom Armburst and do come in around 5900psi.
Best,
Greg
I'd say two Dakota winters is a pretty good test of your 5900 psi load. I use a bismuth load in that neighborhood too, but it's not nearly as cold here, so obviously the Deep South is not a very good test. I'm
not complaining. It seems to me that the complaints I have heard on forums about poor ignition in cold weather came from the use of 4625, which is what I currently use. But, there are faster burning powders that can be loaded to give pressures in the 6000 psi range as well. I'm thinking they are not as subject to "blooping".
A snowy duck hunt here (with those low pressure bismuth loads) is the exception, but it sure was fun ............for me, not the ducks.
Last Saturday of season Jan. 2016 
SRH
