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My New Defensive Edge LRKM

 
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  #141  
Old 08-08-2013, 06:41 PM
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Re: My New Defensive Edge LRKM

Quote:
Originally Posted by Broz View Post
Kirby, and or Greg, Two part question, Kirby pointed out how the BC and velocity of a super 338 can make ELR shots easier. I want to bring that back up and say I can tell you this is a real eye opener to me with the addition of 400 fps over my old 338.

So, I am and have been keeping an eye on the development of the 375's with new bullet offerings. It would be assumed that the larger bore would have a better barrel life too?? Or would the added 30 gr of powder to get the bullets to 3300 keep it close to the super 338's? I feel maybe a little more life from the 375?


Second part, bare with me,... Ok to rebarrel my 338 lets assume the going rate of $250 for thread and chamber and $400 for a tube..= $650. if a 338 terminator round loaded is $1.50 `$1.75 (less brass) what is the cost of a loaded 375 round with a good LR bullet (less brass)? I am trying to figure how much more it will cost to shoot a 375 and include barrel maintenance compared to a super 388 like the Terminator.

Thanks for any info.

Jeff

ps: but then we really have to also think about what it takes to replace all the loading equipment like presses and dies for the big gun.

How do you feel all this weighs out? I know, back to the "Speed Cost Money, How Fast do You Want to Go" thing right..
Hi Jeff.

My 375 Terminator gets along pretty well, basically the same case dimensions as your 338, just in 375, pushes the 350-425s nicely with around 115 grains of powder.

The only real difference is the cost of the projectile.

The 375 barrels will last longer.

The new Lazer CEBs will transform the terminal performace of the solid projectiles.

I do know it is much easier to shoot my 375 DCM than the 338 DCM at distance, the further you want to shoot the easier it is to hit with the 375, the more difficult the conditions the easier it is to hit with the 375.

Ballistic calculations only tell part of the story, IMHO the bigger projectiles "hold" better at distance than the smaller ones even though the calculater says there is very little difference.

The 425s are easier to shoot at distance than the 350s even though they are both very accurate all the way.

PS by at distance I mean a mile +
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  #142  
Old 08-08-2013, 08:19 PM
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Re: My New Defensive Edge LRKM

Looking back on my notes looking at different powders and the amount of each powder that the 338 Lapua Improved design holds when filled to the case mouth, from your numbers N-570 is a pretty dense powder.

Here are the capacities for my 338 AX when filled to the mouth with each of the following powders:

VV 20N29..............114.5 gr
Retumbo................116.3 gr
H-50BMG...............117.3 gr
WC-872.................122.5 gr
RL50......................123.1 gr
WC-860.................123.3 gr
WC-857.................123.4 gr
H-US869................130.1 gr

As you can see, VV N-570 is nearly identical to RL50, WC-860 and WC-857 which makes it a very dense for volume powder.

It always amazed me to see how dense RL50 powder is for being a very large kernal stick powder, yet is has a weight to volume ratio nearly identical to the ultra slow burning surplus ball powders.

Putting N-570 in this same class makes it clear how it can produce some added velocity as it fits a significant amount more weight in a given volume compared to other powders.

I have not measured H-1000. I have never used it in my 338 AX mainly because its to easy to pressure out with that powder in that case volume. It can certainly be used if one wanted to work up a load and be careful watching your pressures but I like a powder that prevents us from getting ourselves into to much trouble with pressure, especially when using the ultra strong Lapua case.
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  #143  
Old 08-08-2013, 08:46 PM
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Re: My New Defensive Edge LRKM

Jeff and Kirby: It is really nice to see some intelligent discussion between a couple of experienced LRH'ers. Seems like old times on this forum now. Thanks a lot.

Jim
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  #144  
Old 08-08-2013, 08:48 PM
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Re: My New Defensive Edge LRKM

Quote:
Originally Posted by Kiwi Greg View Post
Hi Jeff.

My 375 Terminator gets along pretty well, basically the same case dimensions as your 338, just in 375, pushes the 350-425s nicely with around 115 grains of powder.

The only real difference is the cost of the projectile.

The 375 barrels will last longer.

The new Lazer CEBs will transform the terminal performace of the solid projectiles.

I do know it is much easier to shoot my 375 DCM than the 338 DCM at distance, the further you want to shoot the easier it is to hit with the 375, the more difficult the conditions the easier it is to hit with the 375.

Ballistic calculations only tell part of the story, IMHO the bigger projectiles "hold" better at distance than the smaller ones even though the calculater says there is very little difference.

The 425s are easier to shoot at distance than the 350s even though they are both very accurate all the way.

PS by at distance I mean a mile +
Greg,

I am watching this thread with some great interest... concerning the CEB's. If you convince Broz to go the copper mono bullet route you will have made him a new born man ...

... and I will gladly call your local beverage distributor with my card number and buy you a case of your favorite wheat/barley based beverage

Jeff,

The monos are king in the big boys
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  #145  
Old 08-08-2013, 08:51 PM
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Re: My New Defensive Edge LRKM

Thanks Kirby and Greg for that info.


Greg, with 115 gr of what powder and what velocity are we talking if a 1.0 moa bullet is used?

MT4XFore, I am enjoying this conversation too. To say I am a tad excited with my new rifle would be an understatement. So all this is fresh on my brain.

Jeff
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  #146  
Old 08-08-2013, 09:32 PM
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Re: My New Defensive Edge LRKM

Quote:
Originally Posted by Broz View Post
Thanks Kirby and Greg for that info.


Greg, with 115 gr of what powder and what velocity are we talking if a 1.0 moa bullet is used?

MT4XFore, I am enjoying this conversation too. To say I am a tad excited with my new rifle would be an understatement. So all this is fresh on my brain.

Jeff

Hi Jeff.

The 115 is an average charge weight for 330-425 grain CE projectiles.

The 425 has around 0.98-1.0 at 2800+ in my Terminator

With 111 of Retumbo giving 2824, 2826, 2827fps according to my data for a group I shot last year, obviously I don't have to mention work up to this, this is a big action with a little case in it & a long barrel.

I don't use it much now I have the 408 cased DCM

My case holds 125 grains of water to the top.

A bit more info here

375 Terminator

Cheers Greg.
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  #147  
Old 08-08-2013, 09:51 PM
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Join Date: Feb 2007
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Re: My New Defensive Edge LRKM

Greg That is a cool round. But when I go 375 I will probably go with the big cased offering.

Thanks!
Jeff
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