If one doesn't believe the experience of others, one would do very well to test the bullet in question.
The easiest, and cheapest, way to test a bullet is to take 24", or so, stack of newspapers and soak them in water for 36-48 hours. Then prop them up so you can shoot into the stack, towards the facing pages not the edges. Placing some marrow bones in it is not a bad idea but not necessary. Whatever you see when shot at 25 yds or so, expect roughly double that in a live animal but take into consideration the hole will look smaller due to the elasticity of living tissue.
Light bullets lose velocity, energy, and momentum much faster than mid to heavy weights. Factor in the mushroomed nose of the expanded bullet, that creates resistance thus compounding all of these factors. This is why they are not good for quartering away shots. The bullet would have to go through the paunch area before it even reaches the vitals. With light bullets there is so little remaining velocity/momentum that the wound would be tiny. Heavy bullets over come this, not with speed but with momentum, that keeps it plowing through.
It is worth the time to try it and see.