From this discussion, I suspect that my Rem '89 was rechambered in the late 1920s or early '30s when the word "Magnum" was around, and the gunsmith just used the "Magnum" stamp on a "Super 10" reamed chamber. Kinda glad he did; not sure an '89 is a fit chassis for a 3 1/2" magnum! It's HEAVY enough, tho! Good coyote killer.