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terry, i don't have enough experience with optics for those kind of distances to give you an informed answer.
in general, I'd say shoot/practice until you are beyond the capabilities of your kit,...

k, let me get this straight... you feel your current glass is limiting, and you want to upgrade the rifle coz a 208 amax wont fit in the mag.
we're talking about 800 to 1000m shooting ?
call me...

Listen to this (above)

Welcome to the forum.

Keep the Tikka, no reason to upgrade the rifle

What glass are you using on the Tikka ?

Tell us some more about distances you are shooting at...