Might be a replacement barrel. DO NOT FIRE until a gunsmith checks it out
Could you be a little more specific? There are lots of rifles considered large caliber, therefore there are all sorts of ammunition.
all of the .25 variations, and 260 to start with.
All U.S. army springfield rifles were chambered in 30-06 caliber.
Can't be answered without a detailed description of all markings, caliber, finish
Also known as 7.62 NATO, this was the standard full powered rifle caliber for all NATO nations. Rifles included the M14, the British L1A1, the Belgian FN FAL, and even India had a bolt action version of the Enfield in that caliber. It is also used in the M60 machinegun, various sniper rifles, etc.
Can't be answered without knowing ALL markings, type of action and who made it. The caliber will be marked on it somewhere. Might be worn off.
In order to give you an estimate of value. I need to know a few more details like, The model number. Sheridan made 5 different pellet guns and 7 different rifles. The 5 pellet models are E, EB, ED, HB and H20PB. Which one is yours? Is it still working? What condition is it in. Poor, Fair, Good, Very Good or Excellent (Like new) without this information No estimate of value can be given. In 1977 Benjamin airgun purchased Sheridan, In 1992 Crosman purchased Benjamin. Crosman owns Sheridan today. Sheridan and Benjamin look similar. All the .177 and .22 Caliber rifles are marked Benjamin. All the .20 caliber rifles are marked Sheridan. Other than caliber the two models are identical. If you want the owners manual for your pistol a link can be found on the Crosman home page.
No way to answer without a DETAILED description of ALL markings, caliber, features, boxes, papers, accessories, etc..
all winchester model 1894 rifles are marked on the barrel with the caliber they are chambered in.If yours is old enough then the chambering could be worn off through use and time.You will then need to measure the diameter of the barrel,buy measuring the lands and then the grooves.This is best left to a gunsmith.He may also take a casting of the chamber and determine the cartridge that your rifle was chambered for.
If not marked on the barrel, have a gunsmith check it out.
It must be marked on the box "FOR USE IN ALL RIFLES"
Those that are marked for 9mm ammunition. Shotguns, rifles, handguns all have been or are chambered for 9mm