I have a 10-50x60 Nikko Target Master which it s basically the same and use it in HFT competition. It ranges great to around 46 yds then it is so short a throw back and forth rangeing with my 6" wheel, it all seems the same from there to 55 yds.
I marked my wheel to allow but it still is tough in the shadows of the woods. In the open field shots it is not so much of a problem. Shooting in hunter and restricted to 12 magnafication, it is tough with any decent scope at 55 yds IMHO. Now ranging on 30, 40 mag it does fine but you need to jump to open division or WFTF with 12fpe.....hope this helps...