About 1937, but really depends on the model.
Yes, you can fire a .357 Sig round (not a .357 Magnum) in it, but you must first change out the .40 barrel for the .357 barrel.
I think your referring to a model 12 pump action which would have been made in 1913, it doesn't have the model anywhere on it or a date code (to early). The value is greatly (almost completely) determined by condition otherwise it's a 100-1,500 depending. 12-A is a round barrel, 12-B is a 22 short (gallery) round barrel, 12-C is a hexagon barrel, 12-CS is a hexagon but 22 WRF not lr.
The perimeter of a hexagon is the sum of its 6 sides.
whats the measure of a hexagon
Calico
Yes it does, attempting to fire a .357sig round in a .40cal bbl will cause overpressure, case separation, and possible explosive failure of the firing chamber. Never fire any round in a barrel that was not designed for it!
The round arch and barrel valult are similar in shape. The barrel vault is an extension of the round arches which form the vault or roof of a structure.
Sorry, but we need more information on the term "round barrel gun".
A hexagon virus has a round shaped caspid but with six sides. Inside can be either RNA or DNA but not both.
In this model of Winchester rifle,there is no difference in value between the round or octagon barrel.
No
One is round, and one is square.