Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

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

 
LinkBack Thread Tools Display Modes
  #15  
Old 07-27-2012, 05:45 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,364
Re: Matrix 117g 6mm not stabilized in 1-7.5??

Slower twist won't help. You need lower velocity or thicker jackets.
Reply With Quote
  #16  
Old 07-28-2012, 02:15 AM
Silver Member
 
Join Date: Feb 2012
Location: Remington County, PA
Posts: 383
Re: Matrix 117g 6mm not stabilized in 1-7.5??

OK. You do seem like you know. But regardless, isn't his twist still faster than it needs to be, at the velocities he runs?
Reply With Quote
  #17  
Old 07-28-2012, 04:21 AM
Platinum Member
 
Join Date: Dec 2008
Location: Great Falls, MT
Posts: 4,913
Re: Matrix 117g 6mm not stabilized in 1-7.5??

__________________

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.
Reply With Quote
  #18  
Old 07-28-2012, 08:33 AM
Edd Edd is offline
Platinum Member
 
Join Date: Jan 2011
Location: Tulsa
Posts: 1,190
Re: Matrix 117g 6mm not stabilized in 1-7.5??

The jacket on these should be thick enough.

https://cuttingedgebullets.com/cgi-b...on&key=MTH_F13
Reply With Quote
  #19  
Old 07-28-2012, 08:35 AM
Platinum Member
 
Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: Matrix 117g 6mm not stabilized in 1-7.5??

Quote:
Originally Posted by FEENIX View Post

That was not good for the keyboard lmao
__________________
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
Reply With Quote
  #20  
Old 07-28-2012, 10:16 AM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,364
Re: Matrix 117g 6mm not stabilized in 1-7.5??

Quote:
Originally Posted by Max Heat View Post
isn't his twist still faster than it needs to be, at the velocities he runs?
I don't have bullet dimensions, and the Matrix site provides nothing useful for information leading to required twist, or basis for BC.
But with a 117DTAC, 7.5tw is not 'too fast' at all.
7-7.5tw is not 'unusual' for bullets of such a high SD, but 8tw would be.
His bullets are cutting round holes at 400yds, which tells me his stability is at least marginal.
That leaves bullet integrity as suspect, given 3moa of broken.

I don't see this as a bullet 'problem' though. There has always been a balance in this extreme(with jacketed bullets) between required twist and bullet integrity. There will always be someone pushing things to failure. For example: Many shooters over the years have shoe-horned themselves into a tiny corner between stability & blowups with 90gr VLDs and cartridges like a 22-243i.
It's nothing new.
Berger went to thicker jackets in adjustment, sounds like Matrix is adjusting, Sierra was already there. But Sierra never pushed bullet potential to this wall -without help, and failures of course.
And nobody really NEEDED to push bullets to failure, or change bullets to compensate. Thinner jacket bullets shoot real well for the rest of us.

Shooters have tried tweaking back on twist rates to drop 'RPMs' below failure. This does not work because of the price paid in stability.
Stability is not tied to RPMs. There is no RPM that equals stable.
Stability results from displacement overcome -by turn of a bullet: 7.5" of a given air density, per turn, barring no other issues.
While RPMs indirectly help or hurt, this has to be qualified by drag resulting from the adjustment, which takes you right back to displacement per turn. A corner..
On the good side, 7.5"/turn is just that regardless of velocity. So it's resulting stability is good/bad across the board, no matter the resulting RPMs.
On the bad side, an excess velocity, at needed twist, challenges bullet integrity due to resulting RPMs.
OP is in this corner.

Ya see what I'm getting at?
Marshal does.
Lower velocity, or thicker jackets.
Reply With Quote
  #21  
Old 07-29-2012, 12:19 PM
Silver Member
 
Join Date: Feb 2012
Location: Remington County, PA
Posts: 383
Re: Matrix 117g 6mm not stabilized in 1-7.5??

Ok, I do see what you are getting at. And this point, I'll even be so nice as to give you what it is that I take it you are looking for out of me: The admission that I didn't know WTF I was talking about!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Matrix 117g 6mm not stabilized in 1-7.5??
Thread Thread Starter Forum Replies Last Post
G7 bc for .277 165 grain matrix vld Paramudd Long Range Hunting & Shooting 13 07-25-2012 10:04 PM
G7 bc for .277 165 grain matrix vld Paramudd Rifles, Bullets, Barrels & Ballistics 7 07-04-2012 09:30 PM
I want to try the 165 Matrix, but... TannerGun Long Range Hunting & Shooting 14 06-03-2012 10:43 PM
165 Matrix in a 270 WSM Booney Reloading 2 09-28-2011 12:23 AM
7mm RUM and 190 Matrix sledder1 Reloading 3 05-18-2011 05:01 PM


All times are GMT -5. The time now is 01:54 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC