Yes- BUT- in an autoloader, they may not cycle the action. In a lever action, they may not feed properly (too short). In ANY rifle, be certain to clean the chamber well after shooting- you will get a...
Not safely. Despite the tales you have heard about this, the pressures of a .44 Magnum are well above the design pressure of a .410. WHEN (not if) the gun fails, someone is going to be hurt. No....