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Yes, but I wouldn't fire more than 100 rounds before at least cleaning the pipe - UMC's ammo has proven (to me) to leave excess residue. The aluminum casings were not a problem.
It is "safe" to fire, but it will eventually mess up the firing pin.
No. You should never try to load or fire any ammo into a gun other than what it is designed to fire. A .44 caliber gun is designed to fire .44 caliber ammo.
9mm
Generally speaking, no, and, you should never try to fire any ammo from a gun other than what it is designed to fire. You may be able to get it to fire, but you could damage the gun or hurt yourself.
1 man caried it and and another would probably carry the ammo. im quite sure one man could fire it solo
metal
Yes.
No
NO
Check the owner's manual.
you can fire both 5.56 and .223 ammo in a rifle chambered in 5.56...but not the other way around! In a rifle marked .223, you should fire .223 ammo only