close
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

Case capacity gained with improved cartridges

LinkBack Thread Tools Display Modes
  #1  
Unread 01-09-2004, 11:58 AM
PUBLISHER
 
Join Date: May 2001
Posts: 6,518
Case capacity gained with improved cartridges

After doing some more careful measuring, it looks as if my 7 Lapua Improved project will net me somewhere around a 6 grain increase in nominal powder capacity over that of a 7 RUM. That's good enough for me, especially with the advantage gained in brass quality.

The increase gained with the various 30/338 Lapuas of our members over the parent case seems to be somewhere around 7 grains. I would be most interested to learn of the amount of gains achieved with other common "improved' cartridge projects. Who has good data on the 300 Tomahawk project, before and after?
__________________
- -
Long Range Rifles, LLC - Ready To Ship

.
Reply With Quote
  •   #2  
    Unread 01-09-2004, 04:44 PM
    Platinum Member
     
    Join Date: May 2001
    Location: Pennsylvania
    Posts: 1,757
    Re: Case capacity gained with improved cartridges

    Len

    Tomahawk #1 can give you more info on that.
    He and Ray Romain was instrumental in the design of that one.
    I simply used the reamer that was ordered.

    The neck jucture looks the same length but the shoulder is blown out and the shoulder angle is 35 degrees.

    Tom #1 will be around soon I'm sure.

    Later
    DC [img]images/icons/smile.gif[/img]
    __________________
    Darryl Cassel
    Reply With Quote

      #3  
    Unread 01-09-2004, 06:07 PM
    Bronze Member
     
    Join Date: Aug 2002
    Location: N.W. PA
    Posts: 31
    Re: Case capacity gained with improved cartridges

    Len

    The shoulder on the 300 ultra is .520 and the shoulder on the Tomahawk is .535 which gives you a 5 degree body taper with a 35 degree shoulder. Neck length is .286
    Hope this info helps with your reamer development

    Tomahawk#1
    Reply With Quote
      #4  
    Unread 01-09-2004, 06:47 PM
    PUBLISHER
     
    Join Date: May 2001
    Posts: 6,518
    Re: Case capacity gained with improved cartridges

    Tomahawk

    Thanks!

    I assume the shoulder/body junction had to stay where it was?
    __________________
    - -
    Long Range Rifles, LLC - Ready To Ship

    .
    Reply With Quote
      #5  
    Unread 01-09-2004, 07:17 PM
    dwm dwm is offline
    Gold Member
     
    Join Date: Feb 2003
    Location: Texas
    Posts: 736
    Re: Case capacity gained with improved cartridges

    Len,

    What powder are you planning to burn in this really big 7mm case?

    Are you planning on having a long neck on the case to keep the throat from buning out or counting on really slow burning powder to help out with that problem?

    I have read some posts on here on LRH.com about rapid throat errosion with the big 7mms.

    Just wondering if you had a plan in the design of this case which would help this issue out.

    Doug
    __________________
    doug
    Reply With Quote
      #6  
    Unread 01-09-2004, 07:55 PM
    PUBLISHER
     
    Join Date: May 2001
    Posts: 6,518
    Re: Case capacity gained with improved cartridges

    dwm

    I'll use one of the slowest powders, of course. And I'll just re-barrel every few hundred rounds. [img]images/icons/smile.gif[/img]
    __________________
    - -
    Long Range Rifles, LLC - Ready To Ship

    .
    Reply With Quote
      #7  
    Unread 01-09-2004, 08:37 PM
    Silver Member
     
    Join Date: Dec 2002
    Posts: 374
    Re: Case capacity gained with improved cartridges

    Len,

    if you want to increase the capacity and are looking for a big "improvement", just increase the diameter at the shoulder and you'll gain a ton more than all this 40 degree crap. (do that too) Do away with all but about 3-4 thou of taper per inch and the cases wil eject just the same and the capacity will be LOADS bigger.
    __________________
    If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: Case capacity gained with improved cartridges
    Thread Thread Starter Forum Replies Last Post
    Case capacity lever-hed Reloading 3 07-21-2009 12:31 PM
    Case capacity of 338... trader388 Rifles, Bullets, Barrels & Ballistics 5 12-01-2004 07:55 AM
    Case Capacity 7ultra Rifles, Bullets, Barrels & Ballistics 6 10-11-2004 11:21 PM
    Case length reduction upon fire forming Improved cartridges? Brent Rifles, Bullets, Barrels & Ballistics 9 03-18-2003 08:49 PM
    Belted case versus beltless case cartridges Len Backus Rifles, Bullets, Barrels & Ballistics 0 05-02-2001 10:37 PM


    All times are GMT -5. The time now is 01:58 PM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC