They made them in four calibers. 25 Remington, 30 Remington, 32 Remington & 35 Remington. The 25 & 32 are obsolete, the 30 was still available in the 80's & the 35 is still available at your larger sporting goods stores. There are dozens of custom reloaders that will still supply ammo for any of these calibers.
There are over 1500 different cartirdges that are/have been made. Calibers run the range from .17 Hornady to the .700 Nitro express.
The Model 4 is a rolling block. They made ~350,000 from 1890 to 1933 in calibers from 22 short to 32 long...
Made from 1890-1933. @ 356000 made in three variations and four different calibers. I estimate your sn was made in the 1930-33 time frame. Your description is lacking details. Price range from 100-1000
The DE was made in several different calibers. The speed of the bullet (FPS) depends on which cartridge.
The DE was made in 3 different calibers. The speed of the bullet depends on what caliber.
All the calibers made in can be found in various books on Sharps. Proposed will never be known.
RPA rifles are made in a number of different calibers. There is not one single caliber- sorry.
I'm not sure what the question was but Remington called the 141 it's replacement the 760 "The Gamemaster". Both slide (pump) action center-file rifles. The 141 was made from 1935-1950 (Approximately 78,000) in 30,32,35 Remington. The 760 was made from 1952-1981 (over a million) in a lot of calibers... The 760 was then replaced with the now still produced 7600 but it's not called a Gamemaster.
The 30-06 appears to have been one of the few calibers in this model that made it thru the complete life cycle of the 760 Gamemaster, which was fron 1952 to 1980.
They are made in several different calibers. Look on the barrel to read caliber markings.
Remington has made many thousands of 12 gauge shotguns in dozens of different models/configurations.