50-100
No published sn data
Try e-gunparts.com
Try e-gunparts.com Email me, I have an 8 and a 16 rnd clips
No sn data available that I am aware of.
Some air rifles were available in .22 caliber.
a .22 caliber
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.
No publicly available information
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"