It can use either 44 magnum or 44 special
.380 ACP
Yes. The 44 magnum can fire 44 special ammo in the same way a .357 magnum can use .38 Special.
Golden Saber
As long as both the rifle and the revolver are chambered in .44 magnum you can use the same ammunition for both. I have a Henry rifle in .44 mag and a Ruger redhawk .44 mag and I use the same ammo for both. That's one of the nice things about that caliber.
44 magnum
Yes.
Yes, and it is more comfortable to shoot than .44 Mag. Clean the cylinder chambers well after shooting to prevent carbon buildup ahead of the cartridges.
Depends. If you mean the Ruger Mini-14 or Ranch Rifle, yes, you can. It is chambered for .223 and 5.56x45 ammo. If you read the owner's manual (available on the Ruger website) it will tell you that on page 13. The Target Model is ONLY for .223. Of course, the 6.8mm and the Mini-30 use different ammo entirely.
No - they are very different cartridges.
You may use any brand of 7mm Magnum rifle ammo.
Use a .22 magnum. It will kill a deer.