Depends on the power and the hop of the DMR.
My MWS with a stock rubber and Six6 will hop a .45 and it will go straight and true. That was tested at 450fps ( on .2s )
Higher the FPS and better the hop = Heavier weight BB ( Geoffs ) you can run.
This is why snipers running 460-470 fps ( on .2s ) run 0.4 and up. Less affected by nature and holds its energy for a longer distance.
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