I think he asked if there is a MILSPEC for 300 BO

And there isn't. Commercial ammo, while it may, or may not meet a future MILSPEC, isn't MILSPEC because no such MILSPEC exists for 300BO.

Current list of small arms cartridges supported by the Big Green Team:

Joint Munitions Command working with Picatinny Arsenal has the small arms tasking. And they don't list .300 BO.

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