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I live in eastern NC at 150 above sea level temps right now are roughly 70-80 when we shoot. Im headed to Utah (8000) in a couple weeks what is the best powder to remain consist from here to there for not changing my drop that I have established here from 200 out to 750 yards. Currently using R-22. I have retumbo and H1000.

No powder retains the same trajectory as you change elevation.

I understand just trying to figure out which would have the least amount. It also looks like temp has more to do with it then the change in elevation. When I change the temp from 75 to 45 it is 3 inches of difference at 500 yards even with the same elevation.

OK, that's a problem you can fix. In the burn rate range you're talking about, RL-23, Retumbo and H1000 are the high energy temp stable powders. RL-22 is quite poor in terms of temp stability.

What bullet are you using?

I have always run Retumbo in the 300 RUM with 165 and 180gr bullets. I have found the temp stability to be pretty good.

I shoot Retumbo in mine...200grain accubonds and Retumbo is a magic combination

Sighted my rifle in, in VA, took it to Alaska and BC...no problems

I'm shooting 180 grain Accubonds my buddy is shooting 165 Accubonds

What this fella says 👍 For temp stability go with H1000 or Hodgdon Retumbo

As for your Drop, That will change no matter what powder you use. Elevation, Gravity is a WHOLE different deal

You need to Test your Rifle/Load on Paper at the New Elevation you plan to Hunt, This the Only way to know for Sure what’s going on, everything else is a Guess

We will be able to check 200 yard zero and that's about it. as far as the drop changing for elevation it is very minor compared to the temp change for elevation at the extended ranges that's what has me wondering and wanting to try to be as closely prepared as possible.

Put in all the info and just change the temp from 80-45 and it is 3 inches different at 500yds with all else the same https://customturretsystems.com/ballistics-calculator/

For both 180 and 165 Accubonds, Retumbo is the top temp-insensitive powder, and it's not close. There's data on the Hodgdon site, and in the opposite of their usual error it's insanely hot. The Nosler data is better. I can give you load-to velocities from QL if you're using a chrono. I think both sets of data are a little optimistic about velocity, especially for the 24" barrel Hodgdon lists.

Playing with that calculator, it is calculating expected air density based on temp and altitude, NOT velocity change based on powder temp sensitivity. So your actual change in impact is going to be much bigger than what it says if you're using RL-22. If you use say Retumbo, you'll get pretty close to what it says. You can't do better than what it says no matter what power you choose.

Another way to put it is that you've discovered that a hand held weather station is a key component of accurate shooting at longer distances.

If you can check and tune your zero at 200 at the temps and elevation you’ll be at, that’s how I’d roll myself. Check your 200 yard zero and input the correct parameters into your software and go hunting.

I live at 250 feet above sea level in SW GA and have taken my 300 RUM on many elk hunts with zero problems. Like you, I use RL-22 and do not change my load at all. Itll all work out just fine for you....stick with what ya got.