Well just don't forget that 'tune' includes 2 separate attributes.
1. powder tune
2. barrel tune
The two do not often fall on top of each other. That is, best grouping is often not lowest SD from the powder.
You may not see this result at single fixed ranges, due to barrel compensation. So if you load develop at 600yds, for 600yd shooting, then a tuner won't help anything there. That's true.
But long range hunting includes a whole gamut of ranges.
An optimum and forgiving powder node here can help, as WE only get 1 shot.
A barrel 'might' compensate well across ranges. It 'might' not.
A good tuner should flatten/widen a barrel node.
So with a best producing powder node, and a good tuner setting, your hunting shot percentages should improve.
For those who gave it a good hunting try and it didn't work out,, then good try at least.
Perhaps there is some bizarre reason that it just didn't work for you.