BLue book of gun values
Yes
Unknown.
Stevens.
Remington
Take the rifle to a gun shop so they can figure out what make, model and caliber rifle you have. There is no 84 caliber long rifle.
Springfield Armory
H&a
They were made in several calibers- will be marked on the barrel.
WHICH rifle? There is more than one type made in this caliber.
The .950 JD Jones is the largest sporting rifle caliber made.
The REAL ptrs41 was a gas operated semi auto antitank rifle first made in 1938, and was approximately .55 caliber.
Marlin