I had a .375 Whelen Improved for a number of years built on a commercial Mauser action. My velocities were somewhat lower than those stated by others. Seems I got about just under 2,400 fps with a 270 grain Hornady Spire Point, though it was very accurate. With a 300 grain bullet, I never quite broke 2,200 fps. As I look back now, I wonder if bullet expansion would have been sufficient for humane kills on elk at 250 - 300 yards.
There's an old article in HANDLOADER #119 (Jan. 1986) with load data; they reprinted the article in Wolfe's "Wildcat Cartridges Vol.II".
