New Puppy? Check Out the Kennel and Cover Package Deal
Pheasants Forever
Top Banner
Register   Login
Game Bird Hunts Store

Harpole's Ad

Harpole's Main Ad 2
   

Pheasant Hunting Forums:

In case you are looking for the old hunting forums - they have been archived and moved to Archived Hunting Forums
How Rifling Works
Last Post 29 Oct 2010 06:57 PM by huntersjournal. 0 Replies.
Printer Friendly
  •  
  •  
  •  
  •  
  •  
Sort:
PrevPrev NextNext
You are not authorized to post a reply.
Author Messages
huntersjournalUser is Offline Pheasant Egg Pheasant Egg Send Private Message Posts:14 huntersjournal
--
29 Oct 2010 06:57 PM

     Simplified, the firing process works this way:

     
    1. A striker, or firing pin, hits the primer…
    2. … which, in turn, burns the powder.
    3. Gases inside the chamber expand…
    4. … and propel the bullet forward
    5. If the barrel has rifling,  
    6. the groves force a spin in the bullet.
    7. Immediately after the bullet leaves the muzzle, air friction decelerates it
    8. and gravity pulls it down  
     
    Rifling and Bond, James Bond
     
    Bullet trajectories are parabolic, in theory at least. Although friction caused by air molecules decelerates projectiles, trajectories are close to a parable. Therefore, they should travel a predictable path. 
     
    However, wind, barrel and bullet shape imperfections and other factors contribute to a less than perfect shot.  Add to those, the human factor: When the hunter shoots, the weapon recoils and he wobbles a bit. This wobble, although imperceptible, is strong enough to affect the bullet. 
     
    In short, the trajectory of a bullet is anything but a straight line. 
     
    To help stabilize the trajectory, barrels have 2 to 8 spiraling indentations or grooves that impart a spin to the bullet. We call those grooves “the rifling”. 
     
    You may remember the opening sequence in each James Bond film, the one shot from the inside of a gun barrel. Before James turns to the camera and fires his weapon, you can see a few spiraling grooves in the barrel of his rival. That is the rifling.
     
    Similar to the way gyroscopic forces stabilize a toy top or a steadycam, the resulting spin after the bullet travels through the barrel helps stabilize the trajectory and makes it more predictable. 
     
    Because a spinning bullet stubbornly maintains the same attitude, wind resistance and air molecule collisions have fewer effects. Consequently, shooters can reach longer distances and fire reliable shots.
     
    Curiosities
     
    British rifles spin the bullet to the left. Rifles made in the USA spin to the right.
     
    The idea is hardly new. It dates back to the 1490’s Holy Roman Empire, where the first helical grooves appeared in Augsburg, what is present-day Germany.
     
    A spinning bullet can make about 5000 revolutions in a single second.
     
    Now you know why it matters. Happy hunting!
     
    Please check out my facebook page and fan page. We are a local magazine aiming to preserve traditional hunting and the values it has wrought in America and would love your input. Thanks!

     

    You are not authorized to post a reply.


    Register With GameBirdHunts.com Now

    What are you waiting for?  Registration only takes a few minutes and it is completely free.  As a registered user you can set up your profile, make friends with other upland hunters, post on our hunting forums and more.  Click here to register with Gamebirdhunts.com


    Already A Member?  Please Log In Now

    Once you become a registered member this page will display your messages, notifications and updates from the site as well as your friends on Gamebirdhunts.com