The 350 Rem Mag is a ballistic twin to the 35 Whelen in a shorter package. I have two of the old Model 660 laminated stock rifles. Deadly on bears. Getting too valuable to shoot, and brass availability is an issue. Dean Grennell did a write up on the XP-100 .350 Mag some years ago for Gun World magazine. Thought about getting a .350 Mag, barrel for my Encore, but decided it would not offer anything more than my .35 Whelen Improved.