Sierra makes a 63 grain semipointed and Speer a 70 grain roundnose to provide heavier bullets in varmint barrels. Something like a 69 grain boattail would not be stabilized, would yaw and tumble in flight and show a "keyhole" should it hit the target.
I figure a Ballistic Tip will work with the same load as any other 55 or 60 grain bullet. Look 'em up.
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