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Matrix 117g 6mm not stabilized in 1-7.5??

 
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  #8  
Old 07-26-2012, 03:56 PM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Guys could you point me in the direction of the documentation for over spinning bullets. I have always used a faster twist(several calibers) than rec. with great success. I have never been much for reading someone elses theories/experiences when I can develop my own at the range. I think I might have to have a look though to prevent any future mistakes.

Brent
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  #9  
Old 07-26-2012, 10:00 PM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Do you like math?? I believe this is known as the "greenhill" formula (I hope it formats correctly when I save the post - it may not):
Define the Variables: T = Twist rate in 1 turn per inches. L = Bullet length in inches. V = Muzzle Velocity D = Diameter of the bore grooves in inches. Constant = 3.5 Find the optimum twist rate from velocity, bore size and bullet length: T= ( 3.5 * SqRt( V ) * D ) L Find the optimum bullet length from velocity, bore size and twist rate: L = ( 3.5 * SqRt( V ) * D ) T Find the optimum muzzle velocity from bullet length, bore size and twist rate: V = ( L * T D 3.5 ) Find a different constant to fit known optimim combinations. Constant = L * T D SqRt( V )
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  #10  
Old 07-26-2012, 10:20 PM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Oh I forgot, there is also the "miller" formula. But no sense in getting out of hand with the math. But if you DO happen to be one of those individuals who actually enjoys doing math, I could feed you many more numbers, if you want. In THIS post however, I'm going to limit it to only 1. It may be plus or minus a little bit this way or that, if you are a hair-splitter (it's not really THAT critical though). But for starters, the number you should be "shooting" for is around 250,000. Somewhat higher than that should be fine, but I wouldn't suggest much lower than that.
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  #11  
Old 07-27-2012, 06:23 AM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Quote:
Originally Posted by Max Heat
For your bullets to work, you would need to either send them at a lower velocity, or change to a SLOWER twist rate.
Quote:
Originally Posted by smalljawbasser View Post
or get some thicker jacketed ones, which is what the guy who made the bullets said about 4 posts up...
LL!
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  #12  
Old 07-27-2012, 09:14 AM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Hmm, I don't get it. Why this is being brought up again and again??? All I said was that "his" thin-jacket rounds weren't handling his barrel's fast twist rate, at the stated velocity. But if there are folk who believe that something not right about that, I would appreciate it if they would quit beating around the bush, and just say what's on their mind. I sorry, but I just don't have the mental energy to spare on trying to correctly interpret cryptic messages!
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  #13  
Old 07-27-2012, 10:10 AM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Feenix you going to be in Missoula for the 1000yd. match in August? Can't wait to see what that 7.75 dasher will do in the mix.


Brent
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  #14  
Old 07-27-2012, 10:23 AM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

MH - the simple answer is that Marshal had it resolved straight to the point without further complicating the issue.

Blipelt - negative! Enjoy and keep us posted.

Cheers!
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