Glad to hear you've had good results with the 120 BT. I've read how well they worked for others and found some available so will give them a try on deer this year.
I'm using W760 with a magnum primer but haven't got to chronograph it yet. What powder are you using LVJ76?
42.5gr of IMR-4064 and GM210M, just over 2,900 fps. Shoots cloverleafs out of my wife's rifle.
With 760 you can provably get to 3,150 fps or more.