The Helpful Stacker
Strictly speaking .50 is generally used for anti-materiel rifles.
.338 Lapua is most commonly the calibre of choice for snipers nowadays.
Usertim
Hopefully they will use them in anti materiel role not anti-personnel , a few squad equipped with barretts can certainly take out a lot of truck engines in that convoy!
Russian officers, the crew of crew-served weapons...I reckon Ukrainian snipers equipped with .50s aren't going to bypass high-value personnel targets or not delay/disrupt troop movements if its tactically advantageous because someone forgot to provide them with .300s or .338s. If trying to preserve the meat isn't a concern, it's always better to have too much gun than not enough and extra range is like extra fuel in the tanks (for more range).