Don’t overthink it. “Practice” with your hunting ammo enough to know what you need to know for how you hunt.
If you are shooting a lot with something else throughout the year to sustain your marksmanship proficiency and you’re only hunting at short ranges (0-300yrds), then “practice” becomes a matter of function confirmation so you know the firearm and ammo are still behaving as expected. For me, sometimes that’s a matter of taking three to five shots at 100yrds. If you are not shooting anything else to sustain proficiency, then you’ll need to be firing that rifle for marksmanship practice - but if you’re still only hunting short range, it might not need to be high volume practice, and you can probably use any ammo you want for practice, with only a handful of shots of your hunting ammo to confirm zero and catch some “just past MPBR” drop data.
Alternatively, if you’re planning to hunt long range, then you need a lot of practice with some rifle, and certainly substantial practice with your hunting rifle and sufficient evaluation of your hunting ammo to develop your data book for your hunt.
I’d not grab a new box of ammo from a shelf and head afield without confirming velocity and POI/zero, and certainly wouldn’t change ammo without rezeroing and checking velocity, but there’s no sense in burning extra cost just for practice.
I’ll also say here - I have a far lower standard for my general hunting fodder than I do for most of the other shooting I do. Conventionally, standard distance hunting is a rather menial task, and many, many ammunition can accomplish it soundly.