Buy a .22lr go no-go gauge and set the headspace with that. But i wouldn't mess with it as it came from the factory.

https://www.cdsgltd.co.uk/forster-headspace-gauge-22-rimfire-go-length-rimmed-and-belted.html

in that video he has replaced the cz barrel with an aftermarket Lilja match barrel if I remember right from when I had watched it online , the Lilja aftermarket barrels for the cz come with shims to adjust the headspace so that they can be used in any receiver as the tolerances may differ from gun to gun.

When we say match barrel on a magazine fed repeater we dont really get the tightest of chambers as there has to be space for the round to be fed from the magazine and then extracted.
Single shot target rifle- tightest chamber
Magazine fed repeater- slightly larger chamber
semi auto- as wide as a barn door lol

the head space in your new Begara will have been set at the factory, and will be fine for all grades of ammo, if you wanted to adjust it to suit just one ammo manufacturer you could. But it may only give slight changes as your still pushing the round down a factory barrel at the end of the day, and the walls of the chamber will still be larger all your doing is adjusting the depth of where the bullet sits in the chamber.

What type of shooting will you mainly be doing with the rifle, and what accuracy is required for that type of shooting ?

The factory rifle should be capable for every thing you want out of the box

I know the feeling, put it down to the pandemic lol