Put it on a scale
200
it is a little less powerful but not by much
10-1000 USD depending on specifics
50-500 usd
100-400 USD depending on condition.
To get an answer, you need to provide details like, brand, model, condition, serial number.
You would have to give more information. Exactly what brand, model, caliber, and what condition is it in?
Which .45 handgun are you referring to? The .45 Colt revolver (Peacemaker) goes back to about 1873. The traditional "45 Auto" was adopted by the US Military in 1911, but there were other, earlier .45 caliber automatics. And of course, .45 caliber black powder ball and cap pistols, ball and cap revolvers, etc are MUCH earlier than the Peacemaker. So... which handgun?
A 36 caliber round ball typically weighs around 80 grains or 5.2 grams.
6.35mm (.25 ACP) is pretty much a pistol round exclusively. Under US law, you must be 21 to purchase a handgun.
No such model number. Need a detailed description to include caliber/gauge, handgun or longgun, condition and all features.
The smallest, best known centerfire handgun round is the .25 caliber (or 6.35mm). The practicality of the .25cal is questionable: you have all of the costs of a centerfire round, with not much more energy than a .22LR rimfire. In fact, nowadays, you are much more likely to find .22LR pistols than a .25cal. One step up from the .25cal is the .32 caliber. This is just about as out-dated as the .25cal, but there were some very popular weapons in .32 caliber, the Walther PPK (James Bond's weapon of choice) is said to be a .32cal (not a .380ACP). There are also pistols made to shoot rifle (long gun) rounds. These tend to be smaller caliber than a .25 cal, but are fairly modern (like a pistol designed to fire .17cal HMR).