KWK,
I assure you the NorthForks will work wonderfully at about any velocity, I have shot Buffalo with them at 200 plus yards in a 375 and got perfect expansion and good penitration after they slowed down and I had them loaded down to about 2350 at the muzzle...Actually they work better slowed down as they penitrate better and expand a bit less and I like that on Buffalo...Same can be said for the 300 gr. RN Woodleighs......