Hi mate, i used to have a a cz in .17 hmr, but changed it last year and got a .22k hornet dont get me wrong the 17 was a cracking little round for rabbits ,crows out to 100yds +, But i found it was not so effective on a fox at these ranges ok if you got him in the head no problem, but to do this on a regular basis, if and when when it presents itself is not always easy and gives little room for error. My .22k hornet has 3 times the energy of the 17 with a 35 or 40gn ballistic tip bullet, and opens up the killing range to about 200yds with either head or heart/ chest shots and even at this ra