I'd actually like to hear from someone who has seriously had a grizzly charge them and were able to kill it with a handgun in self defense. Not sneaking up on it and killing it, but actually killing a charging ticked off grizzly.
I'll try to chime in on this without straying too far from the topic...
I doubt many guys could answer truthfully that they've had to shoot a grizzly with a handgun in self-defense. I'm a hiker who grew up in Alaska, and I've never had a bear charge me. The number of times a year that an outdoorsman needs to shoot a charging bear is virtually nil; the closest I've come is being there when someone had to shoot a .357 at a pack of wild dogs.
Even though I've never been charged when hiking, I've packed either a big handgun or a hunting rifle plenty of times, just in case. At the end of
every single trip that I did so, I grumbled that I carried all that weight & bulk for nothing. For a while, this made guns like the 329PD very appealing, though I never bought one. Holding one for the first time changed my mind.
As I became more mature, I realized something: I wasn't really packing a big gun for bear protection. I was carrying a big gun because it's what macho outdoorsmen do. Bears are just the excuse.
When I realized that, it completely changed the way I protect myself when hiking. Being prepared for the given trip is a big issue, first and foremost. Minimizing weight is the second big issue. Keeping these two realities in mind, I've settled on carrying bear spray for animals and a small aluminum-framed .38 for personal protection.
Why? These weigh next to nothing; together, they may even weigh less than the 329. I can shoot a small .38 better than I ever will with an ultralight .44 magnum, effectively making it a better choice for personal protection for myself. And if you ask any park ranger, they would probably tell you that bear spray does its job better than any handgun will.
Are these tools macho like a .44 revolver? No. I've given up that claim. But they get the job done. And as a hiker, I've been quite happy with my choice.
Although the original poster appears to be unhappy with the advice offered, I'll answer anyway: no, there are no other .44's that fit those criteria. S&W has that niche covered, and they can keep it.