A single shot firearm does exactly that. Shoots a single shot. A repeating firearm, or automatic shoots many shots while you only have to pull the trigger once. Do not confuse automatic with semi-automatic, which are guns that fire as fast as you pull the trigger.
A single shot firearm is fairly self explanatory. You fire one round, then the weapon must be reloaded with a new cartridge prior to being able to fire again. A repeating firearm gets a bit more complicated because of the incredible number of variants that fall into the category of "repeaters" but in a nutshell, if a firearm holds more than one cartridge, or can have multiple cylinders loaded (in the case of black powder revolvers) it is considered a repeater. If you can fire more than one round without having to reload the weapon, it "repeats" and is therefore a repeating firearm.
A repeating firearm is one that can fire more than one shot before reloading. Repeaters usually store ammunition in a magazine or belt.
The answer depends on what is repeating: 0.87777... is different from 0.878787...
Different places on different guns.
No, because repeating decimals never stop repeating, so it would be impossible to have a different number that does not repeat.
Try www.gunbroker.com and www.auctionarms.com for a good look at what various guns are selling for. Singleshot shotguns can be quite economical, but some are rare and are much more expensive.
Not AFAIK
50-100
Yes, of course. Different denominators in the rational equivalent give rise to different lengths of repeating strings.
The WRACO stamping indicates that your Winchester firearm was produced by Winchester Repeating Arms Company(WRACO).
Each firearm can be a different charge. 10 firearms means 10 different counts.