Around $50
The Benjamin model 300 (Benjamin Franklin was a marketing gimmick name to sell rifles.) was made between 1934-1940. In good shape, today it is worth between $95 and $125
Auction
Benjamin Franklin built the library.
the size and shape
It would be worth around $65 in Excellent shape.
by his brilliant oratory and passion leaving no doubt that freedom was more important than life itself.
In Excellent condition it would be worth between $200 - $250. That is if it has very little wear. The Black or Nickel finish is in excellent shape. It still holds air and is not dinged up. If any of these conditions exist then the value drops sharply.
Can not be answered without knowing how heavy the pellet is, how fast it will be leaving the muzzle, pellet shape, location where it will be shot.
A model C .20 caliber not a model C9 or C9PB in very good condition is worth around $105 to $130. If you want the owners manual, see the link below. Download the C9 owners manual it will be almost the same as the "C" Crosman airguns owns both Sheridan and Benjamin airguns.
Pellet grain is really just the type of shape of the grain. Instead of flake grain it is just shaped like a pellet or, if you will, like a perscriptian drug.
Model 312 Benjamin: Mfg: 1940-1969 (177 & 22 Cal) -------------------------------------------------------------------------------------------------- In perfect shape it is worth around $125
Benjamin made a model 1300 air pistol not a air rifle. It would be worth between $130-$155 in VG shape They were made between 1959-1964 They did make a 3100 air rifle... If you have a 1300 rifle then I do not know the value.....