The whole point of weaponized math is to give you a dope to start with (hence "Try Dope") if you have no idea what your velocity is, Frank goes as far as to say they don't use a chrony at all in their courses as you need to verify dope at all ranges anyway so why not just use weaponized math from the outset.
22lr is different that centrefire in that everyone is effectively using the same cartridge so the differences in velocity and BC are not as much between users as centrefire (consider 6mmCM, 308, 300prc etc). Thus you can just chuck some pretty generic data into a ballistic calculator (say 1050fps and .120 BC) and be close enough to get your try data.
In my experience the hardest thing with 22lr is trying to get an accurate BC value, with centrefire small differences in BC are difficult to notice for most people but small changes in an already very low BC make big changes. So truing rimfire is more difficult as you are trying to true both BC and velocity at the same time.
There are arguments to what range is best to zero your 22lr, if you can't zero on a windless day then opt for less range to reduce the wind error.
The reality is anything from 25m-50m is fine so whatever is easiest for you, with the caveat of wind.