Negative, 308 is a 30 caliber bullet and 30 doesn't fit into 25.
No
0.380 ACP.
12.7x99, also known as .50 BMG (Browning Machine Gun).
Commonly called the 8mm Mauser, the bullet is actually 7.92mm, but that term is not in everyday use.
NO!!
Yes
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.
Need to know rate of twist and what you are going to use it for.
Have it examined by a good gunsmith. This rifle use a .22 caliber bullet, long rifle.
Each weapon will show a preference for one or more bullet weights/loads. Then only way to find out is to buy as many different types as you can afford and shoot them.
the bigger the animal the bigger the caliber of rifle and the heavier the bullet i.e deer 150 grain bullet 243 caliber and up moose 30-06 180 grain and up for both