For one thing, more people die of insect stings and bites than from bear attacks. For another, attacks by MEN are far more likely, and far more deadly. For another, most places, you have to ccw the pistol, or have legal trouble. For another, no, the .44, nor the 454, stop bear charges reliably, if at ALL, with body hits. The 454 at best matches the 30-30, and nobody considers the 30-30 to be a bear stopper, even tho it can hit twice as fast with repeat tries as can the 454 revolver. The .44 pistol doesn't even approach the 20 ga slug when it comes to effectiveness, and nobody considers the 20 ga to be even a decent deer load. 
yes, the .44 will KILL a bear with a chest hit (eventually) but it will be cold comfort to you to have him drop dead, 10 seconds after he rips your head off.
yes, the .44 will KILL a bear with a chest hit (eventually) but it will be cold comfort to you to have him drop dead, 10 seconds after he rips your head off.