According to my calculations a 400 gr Woodleigh weldcore bullet at 2255 fps yields in excess of 4500 ft lbs of muzzle energy, all this on a measly 68 gr of powder makes this an extremely efficient cartridge.
1.5" high at 100 zeros the bullet at 150 yards, it's only down 4" at 200 yards and still churning along at near 1800 fps, the Woodleigh velocity window recommends from 2200 to 1800 fps for maximum bullet performance.
The 400 [Petrov] Whelen seems to be a very serious little butt-kicker men.
Oh, and recoil and noise is very pleasant with this round, especially for what you're delivering downrange.
I did remove my ear plugs and fired one round as if in a hunting situation, as far as muzzle blast is concerned, I found this cartridge to be very pleasant.
