if the 2206 works...I would just run with it and not over think it....the other powders MIGHT be slightly better...if you can find them...2206 is a good powder in .223---7.62x39mm-----.308 its stable and easy to load,does get a bit gritty through powder thrower being such course granuals,but its a good powder,and you have got it.
0-300 you arent going to need to be ultra fast or fussy.
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