From what I have read, hunting kangaroos is more like culling. You go out at night and when you shine a spotlight on the roos they freeze. You can then walk up to them and shoot them in the head.
Standard velocity ammunition is preferred by target shooters for one reason.
It is subsonic. That is it does not exceed the speed of sound. This is why std velocity seems to be not as loud as HV ammo. Most of the noise from HV ammo is in fact the sonic "crack" of the supersonic projectile.
The reason target shooters use std is that it never goes trans-sonic.
That is it does not go back through the sound barrior as it slows down.
The trans-sonic passage can and does cause some instability of a bullet. That's why all high power shooters want their bullets to remain supersonic past the range of their targets. .22 rf HV ammo goes trans sonic at about 80 ~ 100 yards.
None of this of course has to do with the killing power of a .22, just its accuracy.
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