Convert it to 404!!! I just got my CZ550 Safari Magnum back, changed from 375 to 404. It is great. Recoil is very mild, not much more than the 375, it felt to me. Gunsmith had no problems, as only minor changes needed to bolt face, and cartridge is roughly the same length. Balance is similar, as I had the barrel made to 24 inch length, a bit shorter than the standard 375 barrel length. I had the original sights put on the new barrel. Further testing will see what it can do.