Remington produced a slide action (pump) rifle known as the model 760. One of the cartridges this was offered in was .243 Winchester- basically a .308 cartridge necked down to .243 caliber. See the link below for an article on the 760, and some pictures.
a .22 caliber
A .177 caliber air rifle has very little recoil.
.223 caliber or 5.56mm.
No You could build a rifle in .306" or any other caliber but you are likely referring to 30.06. A 30.06 rifle is referred to as "30 Caliber" but to be accurate it is nominally .308"
Yes, I can. A Barrett M107 is a .50 caliber sniper rifle.
The Dragunov (note corrected spelling) sniper rifle is in caliber 7.62x54mmR. This is the same caliber at the Moisin-Nagant 91/30 rifle.
50 caliber
value of a model 49 ithaca 22 caliber rifle
You will need the services of a good gunsmith.
No
Depends on the application. If you mean power, the higher the caliber, the more powerful it is. for example, a .22 caliber rifle is much less powerful than a .50 caliber rifle.
The .45 caliber bullet is not used in a sniper rifle.