Do any of you guys have any problems extracting the rounds after shooting a revolver in cold weather? When I fire the 700grain rounds from my 500 magnum, the shells are REALLY hard to extract. I'm thinking it's the sudden change in temp in the cylinder. I thought maybe it might have been a hot load but I was very careful to work my way up on those loads. It never did it during warm weather. The last time I fired it was before I deployed Oct '06 and it was still somewhat warm then. Any ideas?