Fanzoj made a double rifle weighing as a guess about 2 3/4 lbs. Price tag was several hundred thousand Euros though which might be a factor unfortunately.

Chambered in .17 rimfire possibly. On a thread on NE. I will resurrect it.

I think a 7x57R would be very dandy. A 7x65R very achievable. 6.5x57R's certainly exist as vintage rifles. And even 6.5x53R per another thread.