I thought I had read somewhere that the most accurate rifle tested by SAR was a 177 Diana 45 but the 77 was easier to achieve accuracy with due to weight and small piston etc?
There was a mk2 335 in 177 at my local gunshop a couple of weeks ago. It was priced s bit steep for me but it was in good nick with a scope, just missing its front sight unfortunately. Anyway, its gone now and I can relax!