A 17" 260 will be able to get 120s around 2800fps, 140s around 2600fps, with moderate loads.
In the shorter tubes, Varget or 4064 might provide a touch more velocity than H4350.
I get 2700fps in my 20" 260 with 140gr Hornady HPBT and 43.0gr H4350 and LOVE it.
Most folks that say "if you want a short barrel get a 308" haven't ever tried a short 6.5 and are ignorant of its real-world performance capabilities.
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