 Later, an "improved" version of the 35 Whelen, with venturi shoulders like Weatherby cartridges, was made up, but it never caught on.The 35 Whelen, while never offered as a factory round (although some gunsmiths used to sell properly formed brass for it) has racked up a tremendous record all over the world, rivaling the 375 Holland and Holland in its effectiveness.It was originally designed, partially, as a substitute for the 375 H & H, since rifles for it could be made up using inexpensive 30-06 actions rather than costly magnum-length Mauser Actions It has killed, with aplomb and efficiency, all of the trophy animals in the world, with the possible exception of the “Big Three” (elephant, rhinoceros, and cape buffalo.)