If you mean as an example .270 Win, the Win stands for Winchester as they were the originator of the cartridge.
.243 THOUSANDTHS OF AN INCH DIAMETER BULLET. WIN SIMPLY IS SHORT FOR WINCHESTER, THE ORIGINATOR OF THIS CALIBER. THAT DOES NOT MEAN ONLY WINCHESTER MAKES GUNS IN THIS CALIBER. MANY GUN MAKERS CHAMBER THIS ROUND. IT IS A GOOD DEER, VARMINT, COYOTE ROUND.
Caliber is .243, buy ammo in .243.
Which caliber?
yes
30 caliber with 30 grains of powder
Best left to a gunsmith
9mm IS the caliber. If you mean what is it equivalent to, it is approximately the same as a .38.
What caliber is it... 30-30 WIN, 32 WIN SPL, or 25-35 WIN?
The 08 is referencing the parent case, the .308, necked down to accept at .284 diameter bullet versus the .308 caliber. Other variations of the .308 case: .243 Win, .260 win
Caliber is the diameter of the bore of a firearm. It's expressed in hundredths or thousandths of an inch, as in .45 caliber or .380 caliber. Curiously, the actual diameter of a .38 caliber slug is 0.357 inch.
It denotes a type of 30 caliber ammunition adopted by the Military in 1906.
The term caliber is often used to mean "level of excellence." If someone uses this phrase, they mean he was a good employee.