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Rifles, Bullets, Barrels & Ballistics Applied Ballistics



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Unread 01-18-2003, 05:35 PM
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Join Date: Sep 2001
Location: North, Texas
Posts: 613

Hear about 3,4,5,6,7,8 and 9 grooves in a barrel what determines how many you need?

Also does one give better accuracy over the other? And finally in way way do the number of grooves effect the twist rate?

Hopefully this will help someone else out that may have been wondering the same thing.
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Unread 01-21-2003, 02:12 PM
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Join Date: Feb 2002
Location: Jackson MI
Posts: 247

You may want to check out Lilja's site. Their FAQ has some info on it (about the 5th question down), along with some other good info.

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Unread 02-02-2003, 11:54 PM
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Join Date: Dec 2002
Posts: 374

It means nothing. The number of grooves is mostly set by the way in which they are put in. Some are swaged, some are cut, others are forged.

The Twist rate has nothing to do with the # of grooves/Lands. It is a number of inches that the bullet travels to turn 1 time. Ie, A 1:11 twist is a full rotation in 11"
If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!
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