How many here like to work up their loads for maximimum speed and push the limits of their cartridge? I happened to stumble across an article the other day where the author mentioned heat. The load he was talking about was described as "OK if the weather was cool but if one were to shoot the same load on a blazing hot day it might be a problem". Got me to thinking. Some of my extreme range loads are pretty tightly packed and are right at what I would call the limit for primer flattening and bolt lift. No noticeable case expansion when measured but all the same they are MAX loads and pushing the pressure limits. I also realized that these loads were developed during my winter sessions. I don't particularly enjoy HOT weather so haven't done much shooting on one of those blazing hot days, mostly days of 70-75 degrees max when it's hot, the rest of the time in temps of 60 or less. For the most part, anything I shoot under 500 yards with my .308 is pretty mild but to really "reach out" some loads are "fully packed". Anyone else out there that likes to "dance with the devil" and coax a few more fps out of a load but haven't yet exposed them to days in the 100's? Just wondering what other's may have experienced.