Going by the title it's a bit backwards considering the rifle doesn't do the imaging... And he already has the thermal. As has been pointed out the calibre already used is effective to those distances during he day, why does it change come nightfall?
If you have the money to justify thermal imaging gear then you should really have a bit, ore knowledge regarding calibre choice....
Hey I could be completely wrong, if so nothing wrong with the 308, as has been said subsonic would limit your distance considerably but would extend further than 250m using factory or hand loads
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