So... Update.
The Ruger 77-17 had already been sold by the time I got there.
'Bugger!'
But I'm kinda happy it wasn't.
Because I then walked around to the 'new' rack to see if they had any 457s in stock yet...
And they did. An American in HMR.. For the same price roughly that the scoped second hand Ruger 77. Felt really nice to the shoulder and well balanced. Very nice build quality and walnut stock. Action was nice even for a tight new rifle. Has the option of a switch barrel if someone decides to produce a decent WMR round at some point. So that kinda sealed it for me. I figure its a 'be what you want it to be' rimfire.
So I made a purchase
I pick it up next weekend. Getting my spare Nikko Stirling 4-9x scope on it through the week.
Going to try a few different rounds through it and see what it prefers so I nabbed a 50 box each of:
Hornady 17gr VMax (2550fps) that seems to be the go to here at the moment according to the LGS,
Hornady 20gr XTP hollow points (2375fps) and
CCI 17 gr VNT (that I think are basically identical to the Vmax other than plastic tip colour but we'll see - they do claim to be 2650fps so maybe just different powder).
Can't wait to pick it up and put a few rounds through!
Thanks for all the replies everyone. Will be sure to post up some results after I've thrown a hundred or so rounds through.