I can't speak for that particular Steyr model because I have had other Steyrs but not the pro varmint hunter.
The Steyrs I did have were awesome rifles, very very well made and superbly finished.
With respect to the 22-250 cartridge, yes it is fast and flat shooting.
If you reload it is a wonderful round to play with and is easy to develop loads with rewarding results.
Having had two different tackdriving 22-250s, I have to say... Go for it !