It is impossible to do with just the serial number.
Virtually impossible to determine caliber by just the serial number.
Caliber can not be determined by serial number.
Can't tell the caliber from just the serial number.
Serial numbers do not designate calibers. Look on the brrel to ID the caliber.
No way to know the caliber from just the serial number
The manufacturer is normally stamped on the firearm next to the model, caliber, and serial number.
It would be in 36 caliber or 44 caliber...
Basically impossible to do with just the serial number.
By model, caliber and serial number.
Without the serial number and a complete description of all markings, caliber/gauge and type of action, there is no way for anyone to answer. If you have the serial number but are unwilling to post it, I recommend you go to the Browning website and check their serial number data. You can also find serial numbers in the Blue Book of Gun Values.
You will have to contact Winchester.
No. Serial numbers aer NOT UNIQUE. They are intended to be unique to a given make and model- but a gun can be rebarreled to a different caliber.