The 168, as you mention, is a sleeker bullet that tends to smallish opening:

[Linked Image]

[Linked Image]

The bullet penetrated this spruce log in profile after striking a water-filled plastic bottle at around 200 yards; 30-06.

[Linked Image]

This ogive shape has typically opened wide and flat when I've recovered them. I think this is the shape that is referred to as 'tangent'. Few TSX iterations use such a profile.... unfortunately.

Sometimes, the air you 'let in'matters less than the air you 'let out'.