I would personally consider .308 as the minimum for elk. Cartridges in the 30-06 power range and above would be suitable, if the shooter can place the shot in the right area.
Negative, 308 is a 30 caliber bullet and 30 doesn't fit into 25.
0.380 ACP.
No
Commonly called the 8mm Mauser, the bullet is actually 7.92mm, but that term is not in everyday use.
NO!!
Yes
Short or long action is immaterial, it is the caliber (and energy) of the cartridge that counts. Short action rifles use shorter cartridges, such as the.308 Winchester- an adequate cartridge for elk if the right bullet is used. Long actions use longer cartridges, such as the 30-06- also adequate.
Need to know rate of twist and what you are going to use it for.
They are different ways of expressing the same thing. A bullet that is 7.65mm is just that- 7.65 millimeters in diameter. Is the US, we frequently use caliber rather than millimeters- that same bullet was be a .32 caliber- or 32/100ths of an inch in diameter.
Have it examined by a good gunsmith. This rifle use a .22 caliber bullet, long rifle.
.355 Also referred to a 9mm cartridge............
4.5 cal (9mm) like most guns