With respect, please note the following explanation from the Berger Calculator:
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The term 'stability' can be a misnomer here when the explanation isn't stated. As above, Berger represents that 'stability' should be interpreted as the optimization of the BC, not that it is flying true, creating a round hole or grouping poorly in the target. Far too many of us grew up defining stability as how the bullet landed in the paper. Unstable being a keyhole.
Here, Berger states that down to 1.0 SG the bullet will be stable flight-wise but that the BC will suffer. If you're wanting to maximize the BC when using high BC bullets then you need to pay attention to this SG number more closely.