Might need one to keep it a .25 MOA in all conditions.
It doesn't change near as much as you suggest.
You are making statements suggesting that precision changes as much as 50-100% or more due to environmentals, which is simply not true.
Bench rest shooters use tuners to keep their rifles agging in the 0's and 10's, not to prevent their rifle from opening up by 50-100+%.
Bench rest shooters also do their load work independently of a tuner, as they know that a tuner does not make their reloads more precise. Tuners are also very finicky and hard to truly understand, and people such as Alex Wheeler tells his clients to shoot out at least a barrel or two in bench rest comp without using a tuner. He does this because he understands that ballistics are very multi factoral, and you need to have an excellent grasp of it before you even start adding another variable into play. What's even more interesting is that too bench rest shooters don't even agree on how a tuner works and should he used. That's a big rabbit hole in itself.
A tuner does not make a gun more precise, with the exception of having the potential to make ammo that's sub optimal for your rifle and chamber more optimal, like factory ammo (in some cases).
What bench rest shooters are using tuners for (accounting for very fine adjustments as environmentals change ballistics) is not really applicable to our style of shooting, and not a great example to use to sell the benefit of tuners to our general shooting demographics.
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