Just mounted mine to my HW97 using Hawke medium mounts. Went straight to Pete`s Airgun farm to do some zeroing. It didn`t take long to get it zeroed at 35yds , from then on ,the rest of my aim points aren`t that different to my Bushnell 3200 10x40.
At first I was a bit disappointed that the focus wasn`t as broad as had been mentioned before ie: clear at 35, hazy at 15 and 45. This was sitting in the barn at Pete`s shooting paper to get aim points. But once I went outside and shot HFT targets the clarity , (with the paralax set at 25yds) is superb at 45yds and down to 15yds. The marks on the paralax adjuster seem to be pretty well spot on for ranges.

I would definately recommend the 10x44 Viper for HFT.

Andy Y