I would say that the 1 or 2 # would give you an ideal as to what it will do for you. Getting 8lbs or more could be a waste of money if the powder doesn't do anything for you. A great many years ago I used IMR powder in 4350 & 4831. Found the extreme temperature with those powders. Gave away about 16 lbs of it. So if you like to buy 8lbs + and fine out it doesn't work you, then what. You are sitting on it trying to sell it open containers, and for how much? It will expand your horizons. I don't know how much pressure I develop when I blew a primer out of my case 20 years back, but I never done that again. If there isn't a chart on certain powder showing how it does with temperature changes, you will have to figure it out on your own. Hodgdon does put out a chart, but doesn't have all the powders. (thankful for that) hunt in weather that can varies from 110+ to -20 below. So a powder that fine @ 70dr, and can take your rifle apart @ 110dr.
Right now it's very hard to get any mount of powder. If you try it and it works, just have to wait until more comes out, but at least you have a better ideal of how that powder works. 1 or 2 lbs will give you 70 to 140 load using 100gr per case. That should be more than enough to figure it out.
I know when I get back to Montana I will check out some powders with temperatures variance I use that are not charted. I want thank the other person for taking the time to write up what he has found.