Assuming you refer to a fired bullet, you would examine the bullet- measure it's diameter, length, weigh it, and compare those to known specimens. You would also examine the bullet for striations- markings made by the rifling inside the barrel. The number and direction of twist of the striations may indicate a particular make of firearm.
A type of method of trying to determine which caliber is more efficient.
Many types. First, muzzle loaders do not use cartridge casings. Only autoloading firearms automatically eject a fired casing. Revolvers, and lever action, bolt action, and pump action firearms require a specific action by the shooter to eject a fired casing, as do single shot and double barreled shotguns.
I THINK you are referring to a Spanish Mauser that has been converted to caliber 7.62 NATO. It is a bolt action rifle, and the full name is Fusil Reformado.
Step 1- ALWAYS- Determine that the weapon is unloaded. HOW this is done varies with the type of firearm, but it should ALWAYS be the first step.
Need to know who made it, barrel length, barrel profile, caliber, type of sights, finish. Where did you get your definition of what "good" means in relation to firearms?
Almost impossible to determine what it is without a DETAILED description of ALL markings, type of action, caliber, type of firearm (handgun or rifle or shotgun), condition, etc
Rohm RG-14 .22 caliber revolver. Hinkley missed the President with all shots fired- one shot did hit the door of the limo and ricochet into the President.
You need a type 1 Federal Firearms License to deal in firearms. There are multiple types, but type 1 what is required to firearms for a living. =================================================== You still need a Type 2 FFL to operate as a pawnbroker. A Type 1 covers gunsmiths and dedicated gun stores - Type 2 is exclusive to pawnbrokers. As a Type 1 FFL holder, I can say this with absolute certainty.
You will need to provide a detailed description of all markings on the firearm, type of firearm, caliber, etc.. Many grips can be used on firearms they were not made for.
Depends which type of .38 you're referring to. When most people say ".38", they're referring to the .38 Special. Firearms chambered in .38 Special can fire .38 Special cartridges, and nothing else. The .38 Special can also be fired from a .357 Magnum revolver (but only from revolvers - not from anything with a headspaced chamber). The .38 Special is not compatible with the .38 S&W Long, .38 Super, or any other type of .38 caliber cartridge.
A type of ammunition.
It denotes a type of 30 caliber ammunition adopted by the Military in 1906.