fifty dollars
If you mean legally, yes, in most states in the U.S. a person can own any caliber rifle that is available. I believe there are 1 or 2 states that have state laws restricting caliber.
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 1883 22 caliber colt rifle is valued at $2,275 in excellent condition. I fair condition it is valued at $775.
Depending on condition, about the same as any Marlin 70 rifle.
a .22 caliber
About 50 USD
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"
No. It is much too small.
50- 175 usd