First, there is no such term as "killing range" for a firearm. There is a maximum EFFECTIVE range- the greatest distance at which a skilled shooter can RELIABLY hit a given target with that firearm. In a criminal investigation, that information would give you the likely maximum distance the shooter fired from.
Determines the use of the firearm.
You need to know the range so that you can make sure you are shooting within that range. Outside of your firearm's range, the accuracy and control of the bullet diminishes rapidly - at this range, you are basically firing blind and risk shooting something or someone you didn't intend to.
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To determine the annual temperature range for a location, you would need to know the highest temperature and the lowest temperature recorded in that location over the course of a year. By subtracting the lowest temperature from the highest temperature, you can calculate the annual temperature range.
18 as far as i know.
As far as I know, you can own as many as you want.
Of course! -They kill to eat, and stop killing when they are done eating.
Depends on how you look at it. They know that firearms are multi billion dollar a year business and they know they would like to tap into it. Firearms have so many laws around them that extend to the seller and even the processor. As a firearm owner myself I know that there are cities, businesses and institutions which would like to rid the nation of firearms hence why their are so many new laws. Just like they did with tobacco they opted not to deal with firearms due to future headaches.