Rman, that is some pretty skookum offhand shooting. I notice some kind of "sight" on your gun. How does that setup work. I punched in your calibre, bullet weight and speed and it drew me this trajectory (I could not find the barnes bullet but this should be close)
Are you still able to see the target with that sight? I am assuming one would have to aim pretty high to compensate for the bullet drop.
I have a .450 marlin and i am keen to see how far i can lob a bullet with her