wild bill g, the max loads in the books are pretty safe for the most part in any temps. They take all that into consideration when publishing. There are a lot of loads that are published that you can go way over in a modern rifle because they have to publish loads that are safe in an older rifle. But even the modern rounds published are normally well within safe SAAMI specs so temp variances, while accuracy may be different, the pressures will still be within safe operation pressures.