Here is some information about the 44 magnum:
.44 Remington Magnum (rifle)
For several years after the .44 Magnum was introduced in 1956, a number of gunsmiths paid their bills by converting Model 92 Winchesters for Remington's big revolver cartridge. Some were re-barreled, others were re-bored and re-chambered. A few years later the Ruger autoloading carbine, Winchester Model 94, Marlin Model 336, Marlin Model 94, Remington Model 788 and several foreign made rifles in .44 Magnum came on the scene. The extra barrel length boosted muzzle velocity by about 300 fps, which didn't exactly transform the .44 Magnum into a rifle cartridge but it did make it an excellent choice for the woods hunter looking for a quick handling rifle for use on Whitetails, Black Bear, and wild boar.
Whereas, a good portion of the effectiveness of many cartridges on big game comes from high velocity, the .44 Magnum simply punches a big hole through whatever it encounters. This can be quite important to the fellow who loves to sit down to a venison dinner since, as the old saying goes, "you can eat right up to the bullet hole." If the .44 Magnum has a strike against it as a deer cartridge it is its rainbow like trajectory beyond 100 yards.
"But, at woods ranges it is about as effective as the .30-30 and the .35 Remington."
A few handloaders have tried to transform the .44 Magnum into something it will never be by loading it with lightweight bullets at relatively high chamber pressures. Such bullets with their low sectional densities work fine on broadside shots into the lung area, but for quartering shots they are a poor choice. The 240 grain bullet at about 1800 fps is tough to beat in this cartridge but for deer, hog, and Black Bear load that seldom fails to punch on through and leave a blood trail, no other bullet comes close to the Hornady 265 grain round nose.
Excellent powders for the .44 Magnum are H110, H4227, IMR-4227, Alliant 2400, and W-296.
Source: Hodgdon Data Manual, 26th Edition
The above is an opinion like many others that have been mentioned.
The below link is for a great article on the 35 Remington. Which is to my way of thinking a better consideration then the 30-30 or the 44 mag.
http://findarticles.com/p/articles/mi_m0BQY/is_4_49/ai_98124200