The Hardy suppressor is only 4" forward, so that would give you 1" more barrel.
The 6.5 is very efficient and some times you actually gain a bit by adding a suppressor. And you could try a slightly faster powder to compensate for the shorter barrel.
You haven't said what the original length is but I reckon you could still push 2700 fps. I get 2800 with a 21.5" barrel using N560. If mine was 18" I would try IMR4831.
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