Yes
The Metal Storm with a shot rate of one million rounds per minute
Some air rifles shoot a .117 cal pellet. There is also a 17 calliber round that is used for varmit hunting. It is small but very fast and extremely accurate.
Not sure what a regular gun is- but biathlon rifles are fairly heavy very accurate .22 caliber target rifles. They have precision made barrels and triggers, and sights that are designed for shooting at specific targets. They are not made for long range shooting, or hunting large animals. I shoot a similar rifle (but from a bench rest, not skis!)- those rifles are capable of shooting 5 bullets into one slightly ragged hole at 50 meters. However, I would not like to carry one all day when hunting- they are very heavy.
Priceless, I have killed over twenty deer with mine. It is one of the best shooting rifles I have found.
Unsure of your term "unusable rifles". At one time, rifles that were worn or unsafe for use had the firing pins removed, barrels plugged, and were designated as "drill rifles"- used to practice the manual of arms. Due to legal restraints, this is rarely done now. In the US, the Dept of Civilian Marksmanship has a few Drill Rifles for sale. Band supply companies also sell dummy rifles- used for marching bands, they look something like a rifle, but are not firearms, not capable of shooting, etc.
No one answer- it depends on the laws where you live. WITH the permission of your parents, it could be rather young. My children and grandchildren began shooting .22 rifles WITH me at about 10-11 years old.
One of the best is a Feinwerkbau Westinger & Altenburger. Biathlon Air Rifle Model P700 Aluminum. Average cost $2,480. It's an Olympic Match Rifle. The best air rifles for target shooting are Olympic Biathlon match rifles.
Depending on condition, $350- $600. These are extremely well made rifles. My grandchildren are still shooting the one my mother bought my dad.
they did at one time
The Winchester Fire Arms Company coined the phrase that one in every million of their lever action rifles were perfect and were often given to great shots during shooting competitions in the 1800's
The Remington is a brand associated with firearms and ammunition, notably known for its rifles, shotguns, and handguns. Founded in 1816, it is one of the oldest firearms manufacturers in the United States. In addition to firearms, Remington has also produced various outdoor and shooting accessories. The brand has had a significant impact on American shooting sports and hunting culture.
Without Mods or Hacks, the guns that kill the fastest are probably the Shotguns. As you know, the Spas-12 (the first shotgun in that section) can kill in one hit). It is probably the case with the Ranger and 1887s too. However, AA-12, Striker etc. take more than one shot to kill.