Take it to a gunsmith for verification.
.45 Long Colt.
the m16 uses 5.56 caliber ammo
yes, but better to use standard ammo. +P ammo shakes the pistol a lot.
No
.380 ACP
45+70 Government
The HK 4.6×30mm cartridge.
It will be printed on the barrel
S&W has never made a firearm with the model number of 94
Your Winchester model 1894 angle eject(AE) will accept any commercial made ammunition marked by caliber .45 colt.
No - they are very different cartridges.
The marlin model 781 was chambered for the .22 long rifle.