Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Extreme Long Range Hunting & Shooting (ELR)

Extreme Long Range Hunting & Shooting (ELR) Over 1,000 Yds.


Reply

My New Defensive Edge LRKM

 
LinkBack Thread Tools Search this Thread Display Modes
  #99  
Old 07-08-2013, 09:41 AM
Platinum Member
 
Join Date: Feb 2010
Location: Gillette, WY
Posts: 2,501
Re: My New Defensive Edge LRKM

Broz,

I found the same data when researching a uber slow burning powder to use in my 6.5WSM (trying to extend throat life). N570 is kicking rear end for me as I seem to reach max pressures right around 100% case capacity (or just over).

Frank Green of Bartlein fame hates double based powder & warns that it will erode the throat faster than normal. I have no idea if this is true or what powder he was talking about but I thought the conflicting report was worth sharing.


t
__________________
"I, however, view ethics as an individual decision. My ethics are mine - and I won't explain or justify them to anyone else. I seek nobody's approval, just that of my own conscience. "

Reply With Quote
  #100  
Old 07-08-2013, 02:17 PM
Silver Member
 
Join Date: Sep 2010
Location: New Zealand
Posts: 306
Re: My New Defensive Edge LRKM

Quote:
Originally Posted by Broz View Post
Here is what Vit. claims about the 500 series powders:

Quote from the Vit. web site:

"N500 series

Adding nitroglycerol to the traditional single base powder makes possible in addition to geometry and coating a third controlled variable of ballistic properties: energy content. Vihtavuori calls powders that have nitroglycerol added (maximum 25%) high energy NC-powders, which form N500 series.

Adding nitroglycerol to the high energy N500 series is done by impregnation. After that, the grains are coated with a new type of chemical which results in very progressive burning characteristics.

The composition of a typical high energy powder is as follows:

* nitrocellulose * nitroglycerol

* coating agent * stabilizer

* flame reducing agent * wear reducing agent

Geometrically the powders in the N500 series are equal to the N100 series. Although these new powders have a higher energy content, they do not cause greater wear to the gun. This is because the surface of the powder has been treated with an agent designed to reduce barrel wear. N500 series powders work well at different temperatures, even better than the traditional N100 and N300 series. Temperature sensitivity naturally depends very much on the weapon and on the cartridge. The manufacturing technique employed permits a very high bulk density, which in turn makes it possible to use a bigger charge in a certain limited loading volume."

I am pleased you are getting great results with N570 but I'm sorry to say that the N500 powders do wear out barrels faster than single base powders I have seen this for myself in a few barrels now.
Reply With Quote
  #101  
Old 07-09-2013, 06:14 AM
Gold Member
 
Join Date: Mar 2004
Location: Las Vegas, NV
Posts: 546
Re: My New Defensive Edge LRKM

For me, barrell life is less important than performance of the rifle. I view barrels as consumables, just like bullets and brass. I fully expect to replace the barrels, but I would rather not do so every year. I don't shoot anything that I consider to be a real barrel burner (currently 6x47 Lapua, 30-06 Ackley, 7 WSM, 7 Dakota, 338 LM Improved), but I do like performance.

Jeffvn
Reply With Quote
  #102  
Old 07-09-2013, 08:06 AM
Platinum Member
 
Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 7,734
Re: My New Defensive Edge LRKM

Jeffvn, I agree, this rifle is about performance to me. I wanted to go farther. I was hoping to get to 3K with decent repeatability and a degree of accuracy. My PLRF10 will range to 2990 yards. I now feel I have a rifle to get me there. I think I will go ahead and talk to Shawn about getting a second barrel on order and start it now. Then the barrel swap will be a shorter process. I have owned barrel burners before and found that they are not best used as the every day rifle. But with my 6br and 300 win to shoot most often I hope to get along fine with the new 338. I am sure at some point whether it is a year or 3 years I will need a replacement barrel.

Jeff
__________________
Reply With Quote
  #103  
Old 07-09-2013, 01:38 PM
Silver Member
 
Join Date: Nov 2008
Location: Nelson, New Zealand
Posts: 280
Re: My New Defensive Edge LRKM

Quote:
Originally Posted by Broz View Post
Jeffvn, I agree, this rifle is about performance to me. I wanted to go farther. I was hoping to get to 3K with decent repeatability and a degree of accuracy. My PLRF10 will range to 2990 yards. I now feel I have a rifle to get me there.

Jeff

Now I have a big 338 & 375 on the Cheytac improved DCM case I find my PLRF10 is holding me back.....

Currently working on a 375 VM2imp.

I may have to get a Terrapin to range past 3000yards, I never thought I would need to
Reply With Quote
  #104  
Old 07-09-2013, 06:56 PM
Silver Member
 
Join Date: Oct 2009
Location: USA
Posts: 279
Re: My New Defensive Edge LRKM

Quote:
Originally Posted by Broz View Post
Jeffvn, I agree, this rifle is about performance to me. I wanted to go farther. I was hoping to get to 3K with decent repeatability and a degree of accuracy. My PLRF10 will range to 2990 yards. I now feel I have a rifle to get me there. I think I will go ahead and talk to Shawn about getting a second barrel on order and start it now. Then the barrel swap will be a shorter process. I have owned barrel burners before and found that they are not best used as the every day rifle. But with my 6br and 300 win to shoot most often I hope to get along fine with the new 338. I am sure at some point whether it is a year or 3 years I will need a replacement barrel.

Jeff
Ha ha! Maybe you're gonna have to call Kirby for a 338 Allen Mag! OK, Shawn can prolly get a the reamer, but still - that's a whole lotta brass!
__________________
"I have a very strict gun control policy: if there’s a gun around, I want to be in control of it.”
— Clint Eastwood
Reply With Quote
  #105  
Old 07-10-2013, 06:30 AM
Gold Member
 
Join Date: Mar 2004
Location: Las Vegas, NV
Posts: 546
Re: My New Defensive Edge LRKM

Jeff

Agreed. I currently have chambered and threaded barrels ready to go for my 7 Dakotas and the 338LM Improved (plus barrel blanks in 6mm, 7mm, and 338). When I bought the currently installed barrels I had a spare chambered and threaded at the same time. I have a barrel vice and action wrenches so the swap is not problematic. Keeping ready spares reduced my stress on the whole "barrel needs replaced" situation. I know some folks can't afford the extra cost or have the ability to store them for a long period of time, but if you can I find it makes life easier when you approach the end of a barrel.

For me the 7 WSMs (I have 2) and the 7 Dakotas (I have 2) are the daily shooters at my home range (goes to 950 yards on armor steel plates, and has a known-distance range to 1,000 yards). The 338 LM Improved is reserved for when I go to the desert. So far, I have not taken anything close to the end of my PLRF10s reach; I have a road that limits my current location to roughly 2,350 yards. The guys I shoot with will likely not ever need to go beyond the 2,350 yards that we have on this location, but you never know.

Jeffvn
Reply With Quote
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Current Poll
I currently have hunting preference points in the following states

All times are GMT -5. The time now is 05:19 AM.


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