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Most bullets are designed for a range of velocity and type of medium they are designed for. I suspect that BT's work best on big game "where penetration is important" at what I would call lower velocities similar to what your 7-30 would give. I have seen a write up in the 'Handloader' by Layne Simpson who I think agrees with this point of view.
I don't use ballistic tips on large game. But BT's usually are very accurate. My brother uses 100 gr BT in his 25-06 on crows and they blow a crow to a red powder or red blast similar to the effect of shooting a water balloon. He gets about 1/4 minute of angle out of his BT loads.
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