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burn rate is relative to each manufacturer. they pick one powder as their benchmark and then compare the burn rates relative to that powder. you cannot reliably compare burn rates btw powder manufacters. some charts like the ones above try but you CANNOT reload based on these.
Tried and tested data is the only way to reload.
As for 'how to choose a powder'. Just read the descriptions on the website. When i first started i was trying to get Vihtavouri N-140 but couldnt find it when i went to a store - so i just bought ADI's AR2206H after a quick search on my iphone. It's very close to AR2208 (also known to americans as 'Varget') and has so far produced the best accuracy out of anything ive tried - it was luck.
Just pick one off a description you like and just go from there.
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