i suppose it would have to be tested, which would not be good for the hippos!
44
100-300 USD
@ 44 years old
.44 Magnum
In a .44 Magnum revolver, yes. In a semi-automatic .44 Magnum (such as the Desert Eagle), no.
200-500 depending on where you live
The COP company (now out of business) made a 4 shot .357 magnum, but cannot recall a 4 shot 44.
It can use either 44 magnum or 44 special
Yes. The 44 magnum can fire 44 special ammo in the same way a .357 magnum can use .38 Special.
There ARE rifles and revolvers chambered for the 44 magnum cartridge. If the weapon is marked ".44 Magnum" then it can be used in that weapon. You should know that there are other .44 caliber catridges, and THOSE weapons (44 Special, 44-40, etc) cannot use 44 magnum loads.
One for sale in my local area (Boise, ID) is going for $175.
.44 Long? Check your cartridge again. As for your question, whatever you have, I'm almost 100% certain it won't be compatible with a .44 Magnum firearm. The only cartridge backwards compatible with the .44 Magnum is the .44 Special, and even that has limitations. .44 Special can be fired in a .44 Magnum revolver, but you need to check with the manufacturer before attempting this with a rifle, as the rifle will have a headspaced chamber.