powder temp sensitivity question(s)

[Thelaststraw]

Wow, thank you. That's a ton of information and I really appreciate it. I had talked to one of the instructors over the phone for a bit a month or 2 back but we didn't get into too many specifics. I'm pretty comfortable out to 800 but have no dope past that so it's all new ground for me. I appreciate the reassuring of the velocities since I figured needing about 150-200 more for a safety net. I know that I don't know much, hence the class and goofy questions here. 

  I'll look into the powder and get some chrono numbers myself as suggested. Thank you for all the help.