Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

New case design!

 
LinkBack Thread Tools Display Modes
  #1  
Old 01-20-2006, 09:18 AM
Silver Member
 
Join Date: Apr 2005
Posts: 135
New case design!

This looks very interesting.

http://www.superiorballistics.com/op..._shape_014.htm


http://www.superiorballistics.com
Reply With Quote
  #2  
Old 01-20-2006, 09:37 AM
Platinum Member
 
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,172
Re: New case design!

Looks interesting. Always good that someone is pushing for improvement. Somewhere along the line, thinking has got to change for advancement to be made.

Keep on keepin' on! [img]/ubbthreads/images/graemlins/cool.gif[/img]

How about figgerin' a way to chamber a convergent/divergent nozzle instead of of the straight convergent we now have (Shoulder/neck). If I remember my steam turbine theory correctly, gas velocity is limited by the current arrangement. Just a little 'dry' Friday humor. [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
Reply With Quote
  #3  
Old 01-20-2006, 09:49 AM
Gold Member
 
Join Date: Nov 2004
Posts: 877
Re: New case design!

Not even close to new guys...
The 6mm Thermos Bottle was designed by M.L. McPherson in 1999. It is based on the shortened Lazzaroni Patriot case (or 416 Rigby). This “Thermos Bottle” design was to make a fat and short cartridge, able to handle 115 grs VLDs for 1K br competition. From a 30 inch barrel, it generates approx 3000 fps.
Mr McPherson has patented the hemispherical shape BTW, and it may be just as well for he reports difficulty in forming cases. Somebody has a 45degree conventional shoulder 6mm on the shortened BMG case...
Reply With Quote
  #4  
Old 01-20-2006, 09:52 AM
Official LRH Sponsor
 
Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,822
Re: New case design!

Mcpherson is doing some interesting things but until a more user friendly design is come up with it will never fly with the public. Forming that case is a major project even for the most experienced wildcatters.

It is good that he is testing the efficency thing though. We all get something out of this type of testing and it will show up in the future I believe in a more practical form.

That said, look at the WSSM case, MUCH easier to form to a design like this then the Lazzeroni cases, probably better brass as well [img]/ubbthreads/images/graemlins/grin.gif[/img]!! Hell of alot cheaper!!

I am working on a competition type wildcat similiar to this but in 25 cal to offer better ballistics at 1000 yard comp. Should be out this summer I am hoping!!

Kirby Allen(50)
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
Reply With Quote
  #5  
Old 01-20-2006, 10:20 AM
Gold Member
 
Join Date: Nov 2004
Posts: 877
Re: New case design!

[ QUOTE ]
How about figgerin' a way to chamber a convergent/divergent nozzle instead of of the straight convergent we now have (Shoulder/neck).

[/ QUOTE ]
Roy... bad idea.
The entire idea behind the DeLaval nozzle is to increase velocity of the ejected gas in open air. Restricting the exhaust side of a DeLaval nozzle inside a long tube like a rifle barrel results in condition known as the Bernoulli Lock Effect, or Krushnic Effect: This happens when the nozzle is recessed into a tube by more than one tube diameter. If so recessed, the cylindrical volume below the nozzle forms a secondary expansion chamber which allows the exhaust gasses to expand below atmospheric pressure before leaving the tube. A multi-stage rocket that ejects its booster motor, but not the airframe, is a perfect example. Very damaging; it almost always destroys the lower body airframe beyond use. Named for Richard Krushnic, the rocketeer who characterized the effect in the late '60s.
Seen and experenced it myself more times than id care to admit. It SUCKS Literally! [img]/ubbthreads/images/graemlins/smile.gif[/img]
Reply With Quote
  #6  
Old 01-20-2006, 10:56 AM
Platinum Member
 
Join Date: Jun 2007
Posts: 1,515
Re: New case design!

I didn't read into the information but the picture in the link seems to indicate the designer is going for a case that promotes forward ignition of the powder or at least a focused combustion point. The drawing does not include any vectors for the dispersal or difusion of the primer blast due to the powder in its way so I'm not sure it is an accurate drawing. Mr. Gibbs experimented with forward ignition and even devised a way to modify centerfire cartridges for it. It seemed to work reasonably well and was easier than trying to form these semi circular cases.
__________________
GRAVITY. It's not just a good idea. It's the LAW!
Reply With Quote
  #7  
Old 01-20-2006, 05:34 PM
Silver Member
 
Join Date: Apr 2005
Posts: 135
Re: New case design!

He is working with Norma to produce this..

On the webpage he states the brass will be out late 2005.. now it looks like somtime in 06?
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: New case design!
Thread Thread Starter Forum Replies Last Post
Bullet Design edenfies Rifles, Bullets, Barrels & Ballistics 0 12-04-2008 11:39 AM
Let's Design the Ultimate Soft Gun Case for a Long Range Rifle Ian M General Discussion 8 11-23-2008 07:58 PM
Stock Design cappi Rifles, Bullets, Barrels & Ballistics 9 02-01-2008 01:20 AM
Case design Matt27 Rifles, Bullets, Barrels & Ballistics 3 07-11-2004 05:10 PM
Bullet Design Rifles, Bullets, Barrels & Ballistics 2 03-12-2003 04:01 PM


All times are GMT -5. The time now is 09:19 PM.


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