In addition to the fact that they haven't been made for awhile, they are a great choice for the still-hunter or tracker. Light to carry, not much recoil, and accurate enough for their intended purpose.
I've had a 44 International for over 50 years. Like every other semi-automatic rifle they need to be kept clean and properly lubricated to be reliable. My 44 International will reliably put 5 240 grain factory loads into 3 MOA at 100 yards. I only use it for still-hunting in cover where most of the targets are closer to 50 yards than 100 yards. My other preferred still-hunting rifle is the Winchester 100, another design that needs to be kept clean and properly lubricated and, like the Ruger 44s, seems to produce polar opposite feeingls among shooters.
