Guiseley do a combined FT/HFT club competition and I won it once a few years back using my HW100 with Nikko Diamond 10-50x60. I hadn't realised you didn't have to use the same rifle for both legs of the course.
I just wound it down to 10x and used the lines on the NATO ret. it worked ok, not optimal but usable. The blur was quite bad at close range but I could see enough.