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

 
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  #1  
Old 07-22-2012, 12:56 PM
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Location: Fort Worth, TX
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Matrix 117g 6mm not stabilized in 1-7.5??

I have a 243 Catbird (6mm-06 improved) The rifle is built on a Stolle Kodiak receiver with a Kreiger 1-7.5 twist 29" rem Sendero contour. This rifle shoots 107 SMK and 105 Berger Hybrid Tgts boringly into .2-.3 tenth 5 shot groups at 3480 FPS. I tried some matrix 117 in it and it literally sprayed a 12-15" 5 shot group at 400 yds (the 105 Bergers just shot a 1.3" group at the same distance) The load was retumbo (same powder I use for 105-107 bullets) seated to touch lands and a MV of 3300 fps. The bullets entered the target straight but all over. Is it possible the 1-7.5 at an elevation of 600ft and 3300 fps is not stabilizing these bullets? Any other ideas, I am baffled.
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  #2  
Old 07-22-2012, 02:34 PM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Consult with Marshall Ambrose of Matrix - marshal@matrixballistics.com
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  #3  
Old 07-22-2012, 04:13 PM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Quote:
Originally Posted by Shumba View Post
I have a 243 Catbird (6mm-06 improved) The rifle is built on a Stolle Kodiak receiver with a Kreiger 1-7.5 twist 29" rem Sendero contour. This rifle shoots 107 SMK and 105 Berger Hybrid Tgts boringly into .2-.3 tenth 5 shot groups at 3480 FPS. I tried some matrix 117 in it and it literally sprayed a 12-15" 5 shot group at 400 yds (the 105 Bergers just shot a 1.3" group at the same distance) The load was retumbo (same powder I use for 105-107 bullets) seated to touch lands and a MV of 3300 fps. The bullets entered the target straight but all over. Is it possible the 1-7.5 at an elevation of 600ft and 3300 fps is not stabilizing these bullets? Any other ideas, I am baffled.
You may have some thin jacket bullets? send me your address & I'll send you some thicker ones.
I've seen that exact thing from another 6-06, the thicker jackets will fix it.
or $ back

Marshal
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  #4  
Old 07-22-2012, 07:03 PM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Quote:
Originally Posted by marshal View Post
You may have some thin jacket bullets? send me your address & I'll send you some thicker ones.
I've seen that exact thing from another 6-06, the thicker jackets will fix it.
or $ back

Marshal
Now that's what you call customer service! Cheers!

Ed
__________________

I voted for my "FREEDOM", "GUNS", and "MONEY" - keep the change - UNK.



"I am always proud of my country!"

"Leadership Rule #2: Don't be an @zzhole." - Maj Gen Burton Field.
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  #5  
Old 07-23-2012, 02:24 PM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Quote:
Originally Posted by FEENIX View Post
Now that's what you call customer service! Cheers!

Ed

Ok now I'm sold = Price point + damned accurate + fast shipping + ^ that kind of service

Guess I'm gonna find out how the 270 likes Marshals bullet s too
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Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
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  #6  
Old 07-26-2012, 11:07 AM
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

I just opened up the calc program, and it indicates that the spin imparted onto said rounds at said twist and velocity is equal to 316,800rpm, which (I believe) should be far in excess of what is required to achieve full stabilization. So that definitely not the problem. Oxymoronically speaking, it may be due to your spin being TOO fast, at the velocity that you are spitting them out at, for the thin-jacket bullets to be able conform to. With too thin of jacket, too soft of lead, too fast of twist, the rifling lands can "skid" over the bullet, unable to stay within the grooves cut by the leading edges. This will "skuff" up, or even de-form the bullet, throwing the accuracy off, AND also could prevent it from achieving full rpm. Spinning something up from 0 to 316,800rpm in just a few milliseconds, while accelerating it from 0 to mach 3 within the same time frame, puts EXTREME (difficult to imagine) forces onto it. For your bullets to work, you would need to either send them at a lower velocity, or change to a SLOWER twist rate. Yeah I know, those wouldn't be acceptable options for me, either!
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  #7  
Old 07-26-2012, 03:24 PM
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Join Date: Nov 2011
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Re: Matrix 117g 6mm not stabilized in 1-7.5??

Quote:
Originally Posted by Max Heat View Post
For your bullets to work, you would need to either send them at a lower velocity, or change to a SLOWER twist rate.
or get some thicker jacketed ones, which is what the guy who made the bullets said about 4 posts up...
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