Posted on 09/25/2016 10:03:53 AM PDT by w1n1
When a bullet is fired, the rifling of the barrel puts a twist on the bullet in order to improve accuracy, increase the distance traveled, and to stabilize the bullet as it moves through the air towards its target. Twist rates are often set up as a ratio, such as 1:14, 1:12, or 1:7, which refers to inches per turn. A twist rate of 1:10 means the bullet will turn one time in 10 inches of the barrel.
Rifling was discovered in 15th century Germany and most likely took the science behind arrows, which are fletched in a way that the arrow spins, thereby increasing its accuracy. It did not gain popularity until the 18th century, and was a crucial tool for the young United States to beat the British in the Revolutionary War. Nowadays, gunsmiths use either cut rifling or button rifling to produce this effect, but either technique effectively adds raised lands and depreciated grooves along the length of the barrel that cause the bullet to rotate before it ever leaves the gun. Read the rest of the story here.
Twist,velocity and drop,,,
What ?
Sounds like and old Dance move,
Where Are the .22 rounds ,anyway???
Varmit Dave?
Doesn’t it have more to do with the weight of the bullet? I guess a heavier bullet will most likely be longer as well.
“get the job done” velocity usually means the bullet has enough speed to both penetrate and expand when it hits the intended target
There are too many variables to give a simple answer to your question.
Here is a fairly in depth discussion of the commonly used .308.
http://www.ballisticstudies.com/Knowledgebase/.308+Winchester+7.62+NATO.html
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