What would be the minimum velocity for reliable expansion using the 139gr?

I have a Ruger Predator and it shoots the 140gr A-Max under half inch all day but speed is lacking at just 2,500ft/s.

At 650yds according to Strelok the bullet would be traveling around 1,650ft/s at this speed would the Scenar reliably open?

The reason I'm asking 650yds is the the longest shot I can take on my lease.

Last edited by TN deer hunter; 11/01/15.
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