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Author Topic: Rate of twist  (Read 2494 times)

Offline PA BEN

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Rate of twist
« on: June 18, 2011, 09:48:58 AM »
I have a Winchester Mod.70 ranger youth in 7mm-08. How can I find what the rate of twist it has?

Offline Bofire

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Re: Rate of twist
« Reply #1 on: June 18, 2011, 10:04:45 AM »
You can use a rotating cleaning rod, put a bore brush on it, mark it with a  felt pen shove the brush in all the way, and pull it out for one full rotation and measure the rod to see how far it took for a full rotation. A full rotation in 8 inches is an 8 inch twist.
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Offline addicted

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Re: Rate of twist
« Reply #2 on: June 18, 2011, 11:20:58 AM »
looks like all of their current modesl that come in 7mm08 have a 1:9.5 twist. not for sure what you have... but its pretty likely
"Right now, I am thinking that If my grandmother was here, she would be lecturing me about how there are poor people in Africa, that would just love to have a Ruger, I would just say "Great, granny, lets just ship all the Rugers to Africa!"


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Offline PA BEN

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Re: Rate of twist
« Reply #3 on: June 19, 2011, 05:19:03 AM »
Thanks, gave it a try and came up w/1:9.5 :tup:

Offline PA BEN

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Re: Rate of twist
« Reply #4 on: June 19, 2011, 02:47:20 PM »
So what does the rate of twist have to do w/powder and bullet wt? And is the chamber part of the barrel length? Or does it start at the riffling?

Offline Nape.257

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Re: Rate of twist
« Reply #5 on: June 19, 2011, 10:53:05 PM »
The faster the twist the heaver the bullet you can shoot. A 1-9.5twist is faster than a 1-11twist. Most 7mm RemMag's are a 1-9twist and can stabilise bullets up to a 180gr bullet.

Your 7mm-08 holds less powder than a 7mm RemMag's so it will shoot slower and probably wont stabilise anything much over 160gr's.

Yes the chamber is part of the barrel lenght.
« Last Edit: June 19, 2011, 10:59:29 PM by Nape.257 »

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Re: Rate of twist
« Reply #6 on: June 19, 2011, 10:55:50 PM »
http://www.riflebarrels.com/products/caliber_twist_rates.htm

scroll down to the bottom chart for general caliber/weight to rate of twist specs. there are many charts like this.
"Right now, I am thinking that If my grandmother was here, she would be lecturing me about how there are poor people in Africa, that would just love to have a Ruger, I would just say "Great, granny, lets just ship all the Rugers to Africa!"


Loving life in the Great Northwest one day at a time.

It sounds like it's time to get a new gun.

 


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