Yep, Wooly, I've read quite a few reports about the .500 S&W Handi-Rifles beating themselves to death. The action just doesn't seem to be able to take the abuse, with Remington's current quality control standards. (Which may be why the .460 version was never released.) Perhaps they should have put that one on the 10 ga action...
I have a (Rem) Handi-Rifle in .444 Marlin. Fit and finish are terrible. It's ugly. It's cheap. It's nowhere near the quality of the pre-Marlin or pre-Remington rifles.
But, I've still come to really like the rifle and cartridge. Mine locks up tight and shoots straight. If I could just get the trigger a little smoother and lighter, it would round out the package.
And if I didn't reload, I still wouldn't have a problem with owning an uncommon cartridge. Hornady's .444 Marlin 265 gr FP SuperFormance factory load is readily available, and absolutely fantastic. It's a great bullet, in consistent ammunition, with decent muzzle velocity. It is about the only .444 Marlin factory load that could be used for anything you ever wanted (short of frontal shots on Elephant and spine-shooting Cape Buffalo).