I have just re read your post, T50 or Big Nikko ,not the ideal scope for HFT,have a look for a Hawk SR 6 or a EB 10 x 42.
You want a scope with a smaller objective lens for HFT,ideally with mil dots.
ISP No 18 Sightron
Newbury & Avon Hawks FT Clubs
Shoot with a free spirit