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the fastest powder for a 300-221 fireball
In an AR, the fastest powder that will work in the AR platform has a burn rate in the 2400-AA#9 range. LilGun and N110 also will work well in sub-sonics.
You can find more information on the optimum powders for sub-sonic loads... Unfortunately, you will have to read through the post under the 300 Whisper reloading heading on this site to find all the the information.
320pf
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