เกี่ยวกับกระสุนปืนครับ น่าสนใจมากๆใครที่เก่งๆภาษาช่วยแปลให้เพื่อนๆอ่านหน่อยครับ
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http://www.firearmsid.com/Bullets/bullet1.htmตัวอย่าง เปิดอ่านที่เหลือเองนะครับ
Identifying the manufacturer and caliber of a submitted bullet is an important examination conducted in a forensic laboratory by Firearm and Toolmark Examiners. We've discussed the term "caliber" on a previous page that can be found here.
There are a number of good reasons to determine who made the bullet but one that stands out to be of particular importance occurs when the bullet cannot be identified to a specific firearm through normal firearm identification techniques. Let's say that several shots are fired at a crime scene and all of the shooters are firing GLOCK brand 9mm Luger caliber pistols. In this situation all of the bullets collected will have the same diameter and will have the same general rifling characteristics.
The only way in this situation to determine who may have fired one bullet vs. another is to look at the brand of ammunition that each shooter was using (hopefully they used different brands!) and then try to match the physical characteristics and materials to those used by one brand cartridge or the other.
The fired cartridge cases collected at the scene have headstamps that will identify who made the cartridge case, so once they are identified to the gun they were fired from, we can look at the bullets to see if they are similar to bullets made by those manufacturers.
By identifying the bullet manufacturer we can now determine which gun most likely fired those bullets given the limited universe of this one crime scene. Firearm examiners will examine the unknown bullets and compare the physical properties of the bullets to known standards. Through this process of direct comparison often times the manufacturer can be determined and in doing so provide the investigation just one more clue to help bring the case to a desirable outcome.
There are several things that firearm examiners look for when they examine the bullets. The diameter and weight are helpful in determining caliber, but the materials used and the general shape of the bullet can assist in determining the manufacturer of the unknown bullet.
Let's start with the materials used in the manufacture of bullets
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http://www.firearmsid.com/Bullets/bullet2.htm
