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


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My New Defensive Edge LRKM

 
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  #92  
Old 07-07-2013, 03:31 PM
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Re: My New Defensive Edge LRKM

You might get 1500 but I kind of doubt it because your shooting quite a bit more powder than a Edge. I could see an Edge getting there. If you catch it early enough you could set it back 2" and probably get another 700+ rounds out of it with very little loss in velocity. There has to be a sacrifice somewhere for the velocity and it will most likely be throat life since you are removing part of the rifling already.
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  #93  
Old 07-07-2013, 03:51 PM
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Re: My New Defensive Edge LRKM

Quote:
Originally Posted by IdahoCTD View Post
There has to be a sacrifice somewhere for the velocity and it will most likely be throat life since you are removing part of the rifling already.

I agree about the sacrifice, but not sure I do about the other. Back when I was tuning Blown Nitro and Blown Alky engines, it was the taller thin parts we ground off the pistons in the valve relief. If they were lower they could wick the heat out before they liquified. Leave a taller thin part and it was gone by 1/2 track. Kinda like torching steel. The taller this part will start the cut earlier.

We will see, all speculation at this point. But what I do know is this Mo-fo is an ELR HAMMER!!

Jeff
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  #94  
Old 07-07-2013, 05:25 PM
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Re: My New Defensive Edge LRKM

My 338lm has almost 4000 rounds through the barrel now, using only 570 powder, and 300 grs bullets going 2929 fps at the muzzle.
I still shoot 10 shot groups at 600 yards looking looking like this:




I won the Norwegian 500 meter UNL Championships with it a couple of weeks ago.
That's not too bad, considering it is a 338LM and shooting prone.

I hope to get at least 5000 rounds of good accuracy out my barrel.
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  #95  
Old 07-07-2013, 05:38 PM
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Re: My New Defensive Edge LRKM

Yrcan, I read that N-570 extends barrel life and reduces throat damage over other powders. Your first hand experience is proof something is working. Thanks for the vote of confidence it would be great if I could get 1500. Who knows maybe. I am doing all I can to get there. Watching barrel temps closely and shooting 2 at a time before a cool down. I have worked with performance oriented rigs all my life, so I know speed cost money. But I am sure this will be a less expensive venture than a 6 sec. 230 mph door slammer or a 160 plus mph boat with twin supercharged mills.

jeff
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  #96  
Old 07-07-2013, 05:52 PM
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Re: My New Defensive Edge LRKM

I was told when I started shooting my 338LM, that barrel life would be 1500-2000 rounds, MAX. I found my barrel was at its best at about 3000 rounds, but that could also be because I had learned how to handle the rifle then ;)

Viht N570 is a double based powder, and I have been told that it eats the barrels faster than a single based powder, but I have no indication that this is the truth.
I can no longer see the lands in my barrel, teh grooves are gone, you can see them abot an inch from where the riflings should start, and still I get very nice groups. I tell myself that it is because of the long barrel that this is possible. I likie to think that even though the bullets gets a rough start, it will settle during the long barrel time, and be ok when it leaves. I have no other explanation to it. If you look inside my barrel, you would say it is worn out, but, no.

This is a 10 shot group I shot this winter when the barrel had 3000 rounds through it. Used 250 grs Scenar bullets, and the range was 600 yards.
I do not think I will ever repeat this one.

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  #97  
Old 07-07-2013, 06:03 PM
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Re: My New Defensive Edge LRKM

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."
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  #98  
Old 07-07-2013, 06:12 PM
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Re: My New Defensive Edge LRKM

Well, there you go
I did not know that.
I guess you just have to shoot and see. I guess, you will have more than 2000 rounds of barrel life. I do not know what quality your barrel is, but I guess it is a high quality barrel. I only use Lothar Walter barrels, Match Grade SS. They cost 1300 USD here in Norway, but is worth every penny

Looking forward to see how your rifle performs
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