You've got a nice selection of rat rifles there, Sherm.
Never been a fan of Contenders, don't like them for the break-action for bench shooting, which is 90% of what I do for rats.
I had a Ruger No.3 I restocked and rebarrelled to 17AH and shot it for two years. Great little performer, but as I shoot my bolt guns much more, sold it to a friend in CA two years ago.
If I come across a CZ527 in 17HH at a fair price, it WILL come home with me. Can't say why, just 'cuz, and having factory ammo &brass available is another factor.