You could go for a 260 rem which matches the ballistics of the 300win mag. May be a little small for 700m but there is always the 308. Scott has a 308 which has second round hits at 800m with a 13 inch barrel. 2700fps with a 13"barrel. So a rifle from SSRNZ would give excellent results out to and past 700m. Scott could make a rifle for what ever calibre you want.
Worth a look, could even go 50 cal with 20"barrel if you are keen.
Check out SHOOTING SYSTEMS RESEARCH NZ Ltd - Home for a look at his rifles.
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